Your toddler is learning two languages, but you’ve noticed that other children their age seem to be talking more.
Maybe your child uses only a few English words but understands almost everything you say in Spanish. Or perhaps they’re having trouble expressing themselves in both languages.
Naturally, you wonder whether this is part of normal bilingual development or a sign of a language delay.
The distinction matters. Bilingual children often have different strengths in each language, which can make their development look uneven. But genuine language delays can also occur in bilingual children, and those difficulties shouldn’t be dismissed as simply part of learning two languages.
Understanding the difference starts with looking at your child’s overall communication, not just how many words they use in English.
Quick Answer: Language Delay vs Bilingual Development
Typical bilingual development often involves uneven language skills, while a possible language delay involves difficulties that are not adequately explained by a child’s language exposure or expected developmental variation.
A bilingual child may know more words in one language, mix languages in conversation, or speak less in a language they’re still learning. These patterns can be completely typical.
A language delay becomes more concerning when a child isn’t meeting expected communication milestones, has persistent difficulty understanding or expressing language, or makes limited progress over time.
Here are some important differences:
| More consistent with typical bilingual development | More concerning for a possible language delay |
|---|---|
| Stronger vocabulary in one language than the other | Limited vocabulary overall for the child’s age |
| Difficulty mainly in a newer or less familiar language | Persistent difficulty communicating in familiar languages |
| Continued growth in words and sentences | Slow progress or missed developmental milestones |
| Language mixing during conversation | Difficulty understanding familiar, age-appropriate language |
| Different communication styles across settings | Communication difficulties that interfere with everyday activities |
These are clues, not diagnostic rules. A child can have a language delay while continuing to learn new words, and difficulties do not have to appear identically in both languages.
The most useful approach is to consider your child’s age, communication abilities, language exposure, and development over time.
Why Bilingual Development Can Look Like a Language Delay
Bilingual children don’t always use their languages equally.
A child may speak confidently with family members in Spanish but use only short English phrases at preschool. Another child may understand Mandarin well but prefer answering in English.
These differences are common because children learn languages through the interactions and experiences available to them.
Three patterns are especially important to understand.
Vocabulary Is Distributed Across Two Languages
A bilingual toddler may know words in one language that they haven’t learned in the other.
For example, your child might say:
- “Dog” in English
- “Leche” in Spanish
- “Zapatos” in Spanish
- “Ball” in English
If someone counts only the English words, your child’s vocabulary may appear smaller than it actually is.
That’s why professionals consider vocabulary across the languages a child uses.
There are two related ways to look at bilingual vocabulary:
Total vocabulary counts the words a child produces across both languages. If your child says “dog” and “perro,” both words count.
Total conceptual vocabulary counts the meanings a child can express. In this measure, “dog” and “perro” represent one concept.
Both approaches provide useful information, but neither should be used alone to determine whether a child has a language delay.
The important point is that a one-language word count may not reflect everything your child knows.
For a more detailed explanation, see our guide to total vocabulary in bilingual toddlers.
One Language May Be Stronger Than the Other
Many bilingual children have a stronger language, sometimes called their dominant language.
That language can change as their experiences change.
For example, a toddler who spends most of the day with Spanish-speaking grandparents may initially use Spanish more comfortably.
After starting an English-speaking preschool, the child may begin learning English words quickly and eventually prefer English during play.
This doesn’t necessarily mean the child is losing language abilities or developing a disorder.
It reflects how language learning responds to opportunities for interaction.
A child may also understand a language better than they speak it, especially when they hear it frequently but have fewer opportunities to use it.
Uneven language abilities are not automatically a cause for concern.
What matters is whether your child’s overall communication development is appropriate for their age and experiences.
Understanding and Speaking Develop at Different Rates
Children often understand more language than they can express.
This is true for monolingual and bilingual children.
A toddler may understand “Bring me your shoes” long before they can produce a sentence of similar complexity.
Speech-language professionals describe these abilities as:
- Receptive language: Understanding words, sentences, questions, and instructions.
- Expressive language: Communicating through words, sentences, gestures, and other forms of expression.
A child may have stronger receptive than expressive language skills.
For example, your toddler might follow familiar instructions in Spanish but use only a handful of spoken words.
That information is encouraging, but it doesn’t automatically rule out an expressive language delay.
A child can understand language relatively well while still needing help developing spoken communication.
Our article on receptive vs. expressive language in bilingual children explains this distinction further.
What Typical Bilingual Language Development Looks Like
Typical bilingual development doesn’t require equal abilities in both languages.
Instead, it involves communication skills developing in ways that are consistent with a child’s age, experiences, and opportunities to use language.
Several patterns can be reassuring.
Your Child Continues Developing Communication Skills
Language development doesn’t always happen at a steady pace.
A toddler may use the same small group of words for a while and then begin adding new words more quickly.
You may notice your child:
- Learning new words in either language.
- Beginning to combine words into phrases.
- Understanding more complex instructions.
- Asking questions or making requests.
- Using language for new purposes during play.
These changes show that communication skills are developing.
However, progress alone doesn’t establish that development is age-appropriate.
A child who is significantly behind expected milestones may still need an evaluation even while making gradual improvements.
Your Child Communicates Effectively in Familiar Situations
A bilingual toddler may be quieter in an unfamiliar language environment but communicate more comfortably at home.
For example, your child might rarely answer questions in English at daycare but regularly ask for food, comment on toys, and interact with family members in Spanish.
This difference can reflect language familiarity rather than an underlying disorder.
Look at what your child can do when communicating with people who speak a language they know well.
Can they express their needs? Participate in play? Understand familiar conversations? Communicate ideas appropriate for their age?
These observations help provide a fuller picture.
Still, communication that seems comfortable in familiar situations doesn’t automatically rule out a delay. The complexity of your child’s communication also matters.
Your Child Uses Gestures and Other Ways to Communicate
Toddlers communicate long before they can produce complete sentences.
They may point to something they want, bring you a toy, wave goodbye, or use sounds to get your attention.
These behaviors are important parts of early communication development.
For example, your child might point toward the refrigerator and say “agua” to ask for water.
That combination of gesture and speech shows an effort to communicate.
However, gestures and spoken language are different developmental skills.
A child who points effectively but has very limited spoken vocabulary for their age may still benefit from professional assessment.
Your Child Mixes Languages Naturally
A bilingual toddler might say:
“More leche.”
Or:
“Look, un gato!”
This is called language mixing or code-switching.
It is a common part of bilingual communication and does not mean a child is confused.
Children may use a word from one language because it’s more familiar, easier to retrieve, or appropriate for the person they’re speaking with.
Language mixing by itself is not evidence of a language disorder.
The more important questions are whether your child is developing age-appropriate communication skills and whether they can make themselves understood.
Signs That May Indicate a Language Delay
Although uneven language abilities are common, some patterns deserve closer attention.
A possible language delay involves difficulties that cannot be explained simply by learning two languages.
The following signs are reasons to discuss your child’s development with a pediatrician or speech-language pathologist.
Limited Vocabulary Across Both Languages
A small vocabulary in English alone doesn’t necessarily indicate a delay.
But if your toddler uses relatively few words across all the languages they know, that may be more concerning.
For example, consider two children who are both 24 months old.
Child A uses only 15 English words but regularly uses many Spanish words and combines words into short Spanish phrases.
Child B uses very few words in either language and hasn’t begun combining words.
Child A’s English vocabulary alone may not accurately reflect their overall development.
Child B’s communication pattern raises more concern, particularly if other developmental milestones are also delayed.
These are illustrative examples, not diagnostic criteria.
Age-appropriate expectations matter. By around age two, most children are beginning to combine at least two words, such as “more milk.”
If your child isn’t meeting expected milestones, discuss your concerns with a professional rather than assuming bilingualism is responsible.
You can review our bilingual toddler language milestones guide for additional age-related expectations.
Difficulty Understanding Familiar Language
Understanding language is an important part of development.
A child who has trouble following instructions in a recently introduced language may simply need more exposure.
But difficulty understanding familiar language deserves attention.
For example, your toddler might consistently struggle to:
- Follow simple, age-appropriate directions.
- Identify familiar objects when named.
- Understand everyday questions.
- Respond appropriately to familiar requests.
- Follow conversations during ordinary routines.
Consider how your child responds when someone speaks their strongest or most familiar language.
Difficulty understanding that language may be particularly concerning.
However, hearing problems, developmental differences, and other factors can also affect comprehension.
An evaluation can help clarify what’s happening.
Delayed Word Combinations or Sentence Development
As children grow, they generally move from individual words toward combining words and expressing more complex ideas.
A toddler might progress from:
“Ball.”
To:
“Big ball.”
And eventually:
“Want big ball.”
The exact timing varies, but language milestones provide useful guidance.
If your child isn’t beginning to combine words around the expected age, or their sentence development remains significantly behind age expectations, seek professional advice.
This applies even if your child understands language well.
A delay in expressive language shouldn’t be dismissed simply because the child is bilingual.
Limited Attempts to Communicate
Spoken vocabulary isn’t the only thing worth observing.
Also consider how your child tries to communicate with other people.
Possible concerns include:
- Rarely pointing to request or show something.
- Making few attempts to attract another person’s attention.
- Showing limited use of gestures or meaningful sounds.
- Having difficulty communicating basic needs.
- Rarely initiating age-appropriate social interactions.
These behaviors can have several possible explanations.
They don’t automatically indicate a language disorder, but they are worth discussing with your pediatrician, particularly when accompanied by other developmental concerns.
Little Progress or Loss of Previously Acquired Skills
Children develop at different rates, and progress can be uneven.
However, persistent difficulty acquiring new communication skills may indicate a need for evaluation.
For example, you might notice that your child continues using the same few words over an extended period without developing additional age-appropriate communication abilities.
A more urgent concern is losing skills your child previously used consistently.
If your child stops using familiar words, loses the ability to understand language they previously understood, or shows a noticeable decline in communication, contact your pediatrician promptly.
Loss of previously acquired communication skills should not be attributed to bilingualism without professional assessment.
How to Compare Your Child’s Development Across Both Languages
You don’t need to perform formal language testing at home.
Instead, pay attention to how your child communicates in ordinary situations.
Here are four useful questions.
1. What Can My Child Do in Their Strongest Language?
Think about the language your child hears and uses most comfortably.
Can they understand familiar instructions? Ask for help? Express ideas? Participate in age-appropriate conversations or play?
A child’s abilities in their strongest language provide important information that may not be obvious during an English-only interaction.
2. Is My Child’s Overall Vocabulary Growing?
Notice new words in both languages.
You don’t need to count every word, but occasional notes can help you recognize patterns.
For example:
“Last month, she mainly named foods. Now she’s using words for actions and beginning to combine words.”
This type of observation may be more useful than focusing exclusively on English vocabulary.
3. Are Communication Skills Appropriate for My Child’s Age?
Progress matters, but so do developmental expectations.
A three-year-old who is gradually learning new single words may still need evaluation if their overall expressive language remains well below age expectations.
Likewise, a toddler who understands familiar routines may still have an expressive language delay.
Consider both what your child is learning and whether their communication abilities are developing as expected.
4. Do Communication Difficulties Affect Daily Life?
Think about whether your child can communicate effectively during meals, play, family activities, and interactions with caregivers.
Do they regularly struggle to express basic needs?
Do communication breakdowns interfere with play or relationships?
Are familiar instructions consistently difficult to understand?
These observations can help you explain your concerns to a professional.
No single answer determines whether a delay is present.
The goal is to understand your child’s communication as a whole.
When Should You Seek a Speech-Language Evaluation?
You don’t have to wait until your child shows difficulties in both languages before requesting professional guidance.
An evaluation may be appropriate if your child:
- Isn’t meeting expected speech or language milestones.
- Has persistent difficulty understanding or expressing language.
- Uses very few words or word combinations for their age.
- Has communication difficulties that interfere with everyday activities.
- Makes limited progress despite appropriate language-learning opportunities.
- Has hearing concerns or other developmental warning signs.
- Loses previously acquired communication skills.
If you’re unsure, start by discussing your observations with your pediatrician or a speech-language pathologist.
An evaluation should consider your child’s developmental history, language exposure, and communication abilities across their languages.
It may help determine whether your child’s difficulties reflect expected bilingual variation, a language delay, a language disorder, or another developmental concern.
For detailed guidance about warning signs, referral options, and what to do next, read When Does a Bilingual Child Need a Speech-Language Evaluation?.
How Professionals Distinguish a Language Difference From a Disorder
Speech-language pathologists do not diagnose language disorders based solely on a child’s English vocabulary or performance on one test.
They consider multiple sources of information, which may include:
- Language and developmental history.
- Communication abilities across languages.
- Observations during play and conversation.
- Parent and caregiver reports.
- Appropriate formal and informal assessment methods.
A child may have different strengths and difficulties in each language, so the clinician must interpret those patterns in context.
If you’d like to understand the diagnostic process in more detail, see How Speech Therapists Identify Language Disorders in Bilingual Children.
What Parents Can Do to Support Bilingual Language Development
Whether your child’s development appears typical or you’re waiting for an evaluation, everyday interactions provide valuable opportunities for language learning.
You don’t need expensive programs or complicated exercises.
The most helpful activities often fit naturally into family life.
Continue Using Your Home Language
If Spanish, Mandarin, Arabic, or another language is the language you speak most comfortably, continue using it with your child.
Learning two languages does not cause a language disorder.
Switching exclusively to English is not a treatment for language delays, and reducing the home language can limit opportunities for meaningful communication with family members.
Children benefit from hearing rich, natural language from people who are comfortable speaking it.
You don’t need to use both languages equally or follow a rigid language schedule.
What matters is providing frequent opportunities for responsive interaction.
Talk During Everyday Routines
Ordinary activities provide opportunities to introduce words and model short sentences.
During meals, you might name foods, describe what you’re doing, or offer simple choices.
During bath time, you might talk about pouring water, washing hands, or finding a favorite toy.
During play, follow your child’s interests and describe what they’re doing.
For example, if your toddler pushes a toy car, you might say:
“The car is going fast!”
If they say “car,” you can respond:
“Yes, a red car!”
These interactions introduce language without turning playtime into a lesson.
Read and Play Together
Books, songs, and pretend play create opportunities to hear and use language.
Choose books your child enjoys and talk about the pictures.
You don’t need to read every sentence exactly as written.
You might point to a picture and say:
“Look, a dog! What’s the dog doing?”
If your child doesn’t answer, you can provide a simple model:
“The dog is sleeping.”
During pretend play, describe actions, introduce new words, and respond to your child’s communication attempts.
Keep the interaction enjoyable rather than pressuring your child to repeat words.
Give Your Child Time to Respond
Toddlers sometimes need extra time to understand a question or organize what they want to say.
After speaking, pause and give your child an opportunity to respond.
Accept communication attempts through words, gestures, or a combination of both.
If your child uses an incomplete phrase, you can model a slightly longer one.
For example:
Child: “More juice.”
Parent: “You want more juice.”
The goal is to encourage communication, not constantly correct mistakes.
These activities support language learning, but they are not substitutes for professional evaluation or treatment when a delay is suspected.
Key Takeaways
- Learning two languages does not cause a language delay or language disorder.
- Bilingual children often have uneven vocabulary and communication abilities across their languages.
- A small vocabulary in English alone doesn’t necessarily indicate delayed language development.
- Typical bilingual development should be considered in relation to overall communication, language exposure, and age-appropriate milestones.
- Persistent communication difficulties, missed milestones, or loss of previously acquired skills deserve professional attention.
- Strong comprehension, gestures, or progress in one language can be encouraging, but they do not automatically rule out a delay.
- Parents should continue using their home language while seeking appropriate support when needed.
Final Thoughts
It’s understandable to feel uncertain when your bilingual toddler seems to be developing differently from other children.
A child who uses fewer English words may have a much larger vocabulary in their home language. Another child may speak confidently with family members but become quiet in an unfamiliar language environment.
These differences can be part of typical bilingual development.
But bilingualism shouldn’t be used to explain away persistent communication difficulties or missed developmental milestones.
The most useful approach is to look at your child’s overall communication, consider their experiences with each language, and pay attention to how their skills develop over time.
If you’re concerned, you don’t need to figure everything out yourself.
A pediatrician or qualified speech-language pathologist can help determine whether your child’s development is on track or whether additional support would be beneficial.
And whatever the outcome, continuing to speak, read, play, and connect with your child in the languages your family uses remains an important part of supporting their development.
Frequently Asked Questions
Do bilingual toddlers talk later than monolingual children?
Learning two languages does not, by itself, cause toddlers to begin talking later.
Bilingual children may know fewer words in each individual language because their vocabulary is distributed across languages.
Their overall language development should be considered using information from both languages, along with age-appropriate developmental milestones.
Can bilingualism cause a language delay?
No. Bilingualism does not cause a language delay or language disorder.
Children who are bilingual can still experience genuine speech or language difficulties, just as monolingual children can.
Those difficulties should be evaluated rather than automatically attributed to learning two languages.
Can a bilingual child have a language delay in only one language?
A child may appear delayed in one language because they have had fewer opportunities to learn or use it.
A developmental language disorder generally affects the child’s underlying language abilities, although the observable difficulties may differ between languages.
Because the distinction can be complicated, a qualified speech-language pathologist should consider both languages, language exposure, and other developmental information before reaching a conclusion.
Does strong understanding mean my toddler doesn’t have a language delay?
Not necessarily.
A child may understand familiar language relatively well but still have difficulty developing spoken vocabulary or sentences.
Strong comprehension is useful information, but it does not automatically rule out an expressive language delay.
Should I stop speaking my home language if my child has a delay?
No. Families generally should continue using the languages they know and use comfortably.
Speaking your home language does not cause or worsen a language disorder.
If your child needs speech-language therapy, ask the clinician how to support communication across the languages used in your family.
When should I seek professional help?
Seek professional advice if your child isn’t meeting expected communication milestones, has persistent difficulty understanding or using language, or experiences communication problems that interfere with daily life.
If your child loses previously acquired communication skills, contact your pediatrician promptly.
You do not need to wait for difficulties to become equally noticeable in both languages before asking for help.