Bilingual Toddlers and Late Talking: What's Actually Normal

The Question Bilingual Parents Ask

Your mother-in-law speaks Spanish to your toddler. You speak English. Daycare is English. Your 28-month-old says 'agua' when they want water, 'car' when they see vehicles, and sometimes combines them: 'más car.'

You counted their words. English: 22 words. Spanish: 18 words. Total: 40 words.

Your pediatrician asks how many words your child has. You say "forty." They reference the milestone chart: "Most children this age have 50-200 words." They suggest speech evaluation.

But should you count both languages? Is your child behind, or is this normal for bilingual development? Should you stop speaking Spanish so they can focus on English?

Here's what research actually shows about bilingual toddlers and language development.

The Math Everyone Gets Wrong

Standard developmental milestone charts are based on monolingual children learning one language. When applied to bilingual children, they create false concerns.

How to Count Vocabulary Correctly

Research shows you should count all words across both languages, including words your child knows in both languages.

Example:

• Child says "dog" in English
• Child also says "perro" in Spanish
• That's 2 words total, not 1

If your child knows "water" in English and "agua" in Spanish, count both. These are called "translation equivalents" and they demonstrate sophisticated language understanding—your child knows these are different labels for the same concept.

A 2023 study in the Journal of Child Language examined 156 bilingual toddlers aged 24-36 months. When researchers counted vocabulary in each language separately, 48% appeared to have vocabulary delays. When they counted combined vocabulary across both languages, only 12% had delays—comparable to monolingual rates.

What this means: Most bilingual toddlers who appear delayed in each individual language are actually developing normally when you count total vocabulary.

The Distribution Difference

Bilingual children's vocabulary is distributed across two languages. This means:

Monolingual child: 100 words in English

Bilingual child: 60 words in English + 50 words in Spanish = 110 total words

The bilingual child has more total vocabulary but fewer words in each individual language. When you only count one language, they appear behind. When you count both, they're on track or ahead.

This pattern is normal and doesn't indicate a problem with language learning capacity.

Code-Mixing: Confusion or Competence?

Your child says: "I want más milk."

Your neighbor's monolingual child says: "I want more milk."

Is your child confused? Are they failing to separate the languages?

No. Research shows code-mixing (switching languages within sentences) is normal bilingual development, not confusion.

Why Bilingual Children Mix Languages

A 2024 study in the International Journal of Bilingualism examined why bilingual toddlers code-mix:

Strategic word access: Children use the word they know best for a concept, regardless of which language it's from. If they learned "agua" first but "milk" first, they'll combine them naturally: "más milk, por favor."

Audience awareness develops later: Very young bilingual children don't yet know that some people only understand one language. They use all their vocabulary with everyone. By age 3-4, they start adjusting language based on who they're talking to.

Processing efficiency: Sometimes both words are activated in the brain simultaneously. Using whichever word comes to mind first is efficient, not confused.

Social context matters: Children code-mix more with other bilinguals who understand both languages. This is sophisticated social awareness—they're matching language use to their audience's abilities.

Code-Mixing Decreases Naturally

As vocabulary grows in both languages, most children code-mix less. They develop larger vocabularies in each language, so they have words available in the appropriate language for the context.

But even adult bilinguals code-mix in informal contexts with other bilinguals. It's a normal feature of bilingualism, not something to eliminate.

What NOT to do: Don't punish or correct code-mixing. Don't insist on "English only" or "Spanish only" rigidly. This creates anxiety about communication and can reduce overall language attempts.

What to do: Respond naturally in the appropriate language. Child says "I want más milk," you respond "Here's more milk!" They hear the complete phrase in one language, which provides a model, without making them feel their attempt was wrong.

Bilingual Milestone Timeline

Bilingual children may reach some milestones slightly later than monolingual children, but catch up by school age. Here's what research shows is typical.

18-24 Months

Typical bilingual development:

• 10-50 words total across both languages
• May not be combining words yet (two-word phrases come slightly later in some bilingual children)
• Understands simple instructions in both languages
• May have vocabulary surge in one language more than the other (whichever they hear most)

What's normal: Lower word count in each individual language compared to monolingual peers, but combined vocabulary in typical range.

24-30 Months

Typical bilingual development:

• 50-100+ words total across both languages
• Beginning to combine words ("más agua," "big truck," "daddy gone")
• Code-mixing is common and normal
• May heavily favor the dominant language (whichever they hear most frequently)

What's normal: Some bilingual children are still in the single-word stage at 30 months while monolingual peers are using 2-3 word phrases. This gap typically closes within 6 months.

30-36 Months

Typical bilingual development:

• 100-200+ words total across both languages
• Using 2-3 word phrases in at least one language
• May use longer phrases in dominant language, shorter in minority language
• Beginning to show awareness of who speaks which language

What's normal: Uneven development between languages. They might use complex sentences in English but single words in Spanish (or vice versa), depending on exposure patterns. This doesn't indicate a problem—it reflects input differences.

36-48 Months

Typical bilingual development:

• 200+ words across both languages
• Using sentences in both languages (complexity may differ)
• Actively differentiating languages based on conversation partner
• Code-mixing decreases but doesn't disappear entirely

By school age (5-6 years), most research shows bilingual children have caught up to monolingual peers in language development measures, often with added advantages in executive function and metalinguistic awareness.

When Bilingualism ISN'T the Issue

Bilingualism doesn't cause language delays. If your bilingual child has a language delay, they'd have the same delay if they were monolingual.

True Language Delays Show Across Both Languages

Research on bilingual children with language disorders shows delays affect both languages similarly.

A 2022 study in Applied Psycholinguistics examined how to distinguish language difference (normal bilingual development) from language disorder:

Language difference (bilingual development):

• Lower vocabulary in each individual language, but combined vocabulary is typical
• Code-mixing present
• Strong comprehension in both languages
• One language may be significantly stronger than the other
• Making progress over time in both languages

Language disorder (requires evaluation):

• Very low vocabulary in both languages combined
• Poor comprehension in both languages
• No progress over 6+ months in either language
• Difficulty following simple instructions in any language
• Limited communication attempts in any context

The key distinction: True language disorders affect language ability generally, not just one specific language. If your child understands and speaks one language appropriately but struggles with the second, that's typically an exposure issue, not a disorder.

Red Flags That Cross Language Boundaries

Consider professional evaluation if your bilingual child:

• Has fewer than 50 words total across both languages by 30 months
• Doesn't understand simple instructions in either language by 24 months
• Shows no growth in either language over 6 months
• Isn't combining words in any language by 36 months
• Avoids communication attempts in all contexts
• Has difficulty being understood by family members in both languages by 36 months

These patterns suggest something beyond typical bilingual development and warrant assessment by an SLP experienced in bilingual evaluation.

Read more about general language development milestones and when to seek evaluation.

The "Should We Stop Speaking Our Language?" Question

This is the question bilingual families are often asked—by doctors, well-meaning relatives, or concerned teachers. The research answer is clear: No, do not stop speaking your home language.

Why Maintaining Home Language Matters

Cultural and family connection: Your home language connects your child to grandparents, extended family, heritage, and identity. Eliminating it cuts off these relationships and cultural roots.

Cognitive benefits: Research from 2023 in Child Development Perspectives shows bilingual children demonstrate advantages in:

• Executive function (ability to focus, switch tasks, inhibit impulses)
• Metalinguistic awareness (thinking about language itself)
• Social perspective-taking (understanding different viewpoints)

These advantages persist into adulthood and apply across academic and professional contexts.

Linguistic foundation: Strong development in a first language provides a foundation for learning additional languages. Children with solid language skills in one language typically acquire second languages more easily.

It doesn't help English: Stopping the home language doesn't speed up English acquisition. Children don't have finite "language capacity" where learning one language prevents learning another. They can learn both simultaneously without either suffering.

What Actually Helps Both Languages

Instead of eliminating one language, increase quality input in both:

Consistent use at home: Parents speak their strongest language naturally at home. Forced English by non-native speakers provides lower-quality input than fluent use of the home language.

Rich language exposure in English: Preschool, playdates with English-speaking peers, library story times, quality children's media. Your child will get English exposure through community—you don't need to provide it at home if it's not your strong language.

Reading in both languages: Books in both languages, even simple ones. Read-alouds provide rich vocabulary and sentence structure models.

Interactive conversation: Quality over quantity. Ten minutes of engaged conversation where you respond to your child's interests matters more than hours of background TV in any language.

Use evidence-based language support techniques in whichever language you're most comfortable—these strategies work across languages.

Supporting Bilingual Language Development Practically

Strategies that support monolingual language development also support bilingual development.

Follow Your Child's Lead

Talk about what they're already focused on, in whichever language feels natural to you. If they're playing with vehicles and you speak Spanish naturally, narrate in Spanish: "Mira el camión grande! El camión rojo. Vroom!"

Visual learning tools work regardless of which language you use to talk about them. The key is rich conversation and interaction in whichever language you speak most fluently.

Accept and Extend Code-Mixing

When your child says "I want más juice," respond naturally: "You want more juice? Here's more juice!" or "¿Quieres más jugo? Aquí está el jugo."

You're providing a complete phrase in one language without correcting their mix. This models without shaming.

Create Language-Rich Contexts

Singing, reading, playing games, cooking together, running errands—all provide language input. The specific language matters less than the quality of interaction.

Some families use "one parent, one language" approaches (each parent consistently uses one language). Others use "place-based" approaches (home language at home, English outside). Both work. Choose what feels natural for your family.

Don't Force Language Separation

Rigid rules ("We only speak Spanish at home! No English allowed!") often backfire. Children resist, or they don't tell you about their day because they learned it in English and can't translate yet.

Let language use be natural and responsive. If your child starts a conversation in English, you can respond in your home language—they'll understand. Over time, they'll acquire receptive skills in both languages even if production (speaking) is stronger in one.

Finding Bilingual-Competent Evaluation

If you do seek evaluation, finding an SLP experienced in bilingual assessment is critical.

Why bilingual experience matters: Standard English-only testing underestimates bilingual children's abilities. An SLP experienced in bilingual assessment will:

• Test in both languages (or use interpreters)
• Count combined vocabulary across languages
• Understand that code-mixing is normal
• Differentiate language difference from language disorder
• Provide recommendations that respect your home language

Questions to ask potential SLPs:

• "Do you have experience assessing bilingual children?"
• "Will you evaluate my child in both languages?"
• "How do you distinguish typical bilingual development from language disorders?"
• "Will your recommendations include maintaining our home language?"

If you can't find a bilingual SLP in your area, ask for one who at least has training in bilingual assessment and will use interpreters.

The Bottom Line for Bilingual Families

Bilingualism is not a handicap. It's not a risk factor for language delays. It's not something to eliminate if your child is slow to talk.

What research clearly shows:

• Bilingual children's combined vocabulary is comparable to monolingual peers
• Code-mixing is normal development, not confusion
• Bilingual children may reach some milestones slightly later but catch up by school age
• True language disorders affect both languages similarly
• Maintaining home language provides cognitive, cultural, and social benefits

If your bilingual child seems delayed, first check that you're counting vocabulary correctly (across both languages). Then consider whether comprehension is strong in at least one language. If yes to both, you're likely seeing normal bilingual development.

If your child has very low vocabulary in both languages combined, poor comprehension in both languages, or no growth over 6+ months in either language, seek evaluation from someone experienced in bilingual assessment.

But don't stop speaking your language. Your child's bilingualism is a gift—one that research shows provides lifelong cognitive and social advantages.

Count the words in both languages. Celebrate the code-mixing as linguistic sophistication. Keep speaking your home language with pride.

Your child is learning two windows into the world. That's not a deficit. It's a strength.