Autism and Bilingualism: Should Bilingual Families Use One Language?
Worried that two languages will confuse your autistic child? Research says no. Learn why bilingualism is safe and beneficial, and how to support language in multilingual homes.
Autism and Bilingualism: Should Bilingual Families Use One Language?
TL;DR: If your family speaks more than one language, you’ve probably been told to “just use English” with your autistic child to avoid “confusion.” This outdated advice is contradicted by research — studies consistently show that bilingualism does NOT delay language development in autistic children and may even provide cognitive and social benefits. Autistic children CAN learn two (or more) languages, and restricting a child to one language can harm family relationships, cultural identity, and access to extended family. This guide covers what the research shows, how to support bilingual development in autistic children, and how to find ABA and speech services in your home language.
“Just speak English at home. Two languages will confuse him.”
If you’re a bilingual or multilingual family raising an autistic child, you’ve likely heard this advice — from a doctor, a therapist, a school professional, or even a well-meaning family member.
It feels logical. Your child is already struggling with language. Why make it harder by adding a second one?
But the research is clear: this advice is wrong. And following it can cause serious harm to your family.
What the Research Shows
Bilingualism Does NOT Cause Additional Language Delay
Multiple studies comparing bilingual and monolingual autistic children have found:
| Finding | Source |
|---|---|
| No significant differences in language milestones between bilingual and monolingual autistic children | Petersen et al., 2012 |
| Bilingual autistic children develop vocabulary at comparable rates to monolingual autistic children | Hambly & Fombonne, 2012 |
| Bilingual exposure does not worsen autism-related language challenges | Ohashi et al., 2012 |
| Bilingual autistic children show similar word learning trajectories to bilingual typically developing children | Reetzke et al., 2015 |
Potential Benefits of Bilingualism in Autism
Research suggests bilingual autistic children may show advantages in:
- Executive function: Bilingualism exercises cognitive flexibility — switching between languages requires mental shifting, a skill that’s often challenging in autism
- Social communication: Access to more communication partners and cultural contexts
- Cognitive reserve: Bilingual brains show enhanced neural connectivity
- Cultural identity: Connection to heritage, community, and extended family
The Real Harm of Language Restriction
When professionals tell bilingual families to use only English:
| What They Intend | What Actually Happens |
|---|---|
| Simplify the language environment | Parents speak less naturally, reducing total language input |
| Reduce “confusion” | Child loses access to grandparents, extended family, and community who speak the home language |
| Focus language development | Family relationships suffer; parents feel less competent communicating in their non-dominant language |
| Help the child in school | Child’s cultural identity is undermined; heritage language loss |
| Make therapy easier | Child receives lower-quality language input (parent’s weaker language) |
The worst outcome: A parent who is most expressive, warm, and fluent in Spanish is told to speak only English — and their interactions become stilted, reduced, and less emotionally rich. The child gets LESS language input, not better quality.
Find ABA providers near you who support multilingual families and provide culturally responsive care.
How to Support Bilingual Development
General Principles
1. Use whatever language is most natural in each context.
- If you’re most comfortable in Mandarin, speak Mandarin
- If your partner is most fluent in English, they speak English
- If Grandma only speaks Vietnamese, she speaks Vietnamese
- The child learns to associate languages with people and contexts — this is normal and healthy
2. Prioritize quantity and quality of language input.
- More language input in ANY language is better than restricted input in one language
- Rich, natural, emotionally warm communication matters more than which language it’s in
- Reading, singing, narrating daily activities — all of this builds language, in any language
3. Don’t mix languages mid-sentence unnecessarily (but don’t panic about it).
- Consistent language exposure helps, but code-switching is natural in bilingual families
- Your child will learn to sort languages — bilingual children do this remarkably well, even autistic ones
- The “one parent, one language” approach works for some families but isn’t required
4. Expect the languages to develop at different rates.
- The language with more exposure will typically be stronger
- This is normal for ALL bilingual children, not just autistic ones
- Both languages will develop if both receive input
Supporting Each Language
| Strategy | How |
|---|---|
| Dedicated language time | Certain activities in each language (bedtime stories in Spanish, school prep in English) |
| Language-rich activities | Songs, books, videos, games in each language |
| Extended family involvement | Grandparents, aunts, uncles — speakers of the home language |
| Cultural activities | Community events, religious services, playgroups in the home language |
| Media | Shows, music, audiobooks in both languages |
| Peers | Playmates who speak the home language |
For ABA Therapy
Ideal: ABA therapy in both languages, or at least with providers who understand bilingualism:
- Bilingual therapists can support skills in both languages
- Language goals should account for bilingual development (total vocabulary across BOTH languages, not just one)
- Manding (requesting) should be taught in whatever language the child’s communication partners use
- Verbal behavior programming can target operants in both languages
- Generalization should include language contexts — skills in English AND the home language
If bilingual therapists aren’t available:
- Therapy can be in English while home language is maintained at home
- Parent training should include strategies for the home language
- ABA team should never recommend dropping the home language
- Share language goals with both ABA and speech therapy teams
For School
- Bilingual education or dual-language programs are appropriate for bilingual autistic children
- IEP goals should respect bilingualism (IEP meeting guide)
- English-only recommendations should be questioned with research
- Assessment should ideally be done in both languages to get an accurate picture of abilities
Take our matching quiz to find ABA providers who offer bilingual or multicultural services.
Common Scenarios
”My child only responds in English even though we speak Spanish at home”
This is common and doesn’t mean they’re not learning Spanish. Many bilingual children prefer responding in the dominant community language but understand both. Continue Spanish input — receptive bilingualism (understanding both, speaking one) is still bilingualism and can become productive (speaking both) over time.
”My child mixes languages”
Code-mixing (using words from both languages in one sentence) is a NORMAL part of bilingual development in ALL children. It’s not confusion — it often fills vocabulary gaps (using the known word from whichever language has it). It typically decreases as vocabulary in both languages grows.
”The BCBA said to use only English during sessions”
Ask why. If it’s because the BCBA only speaks English, that’s a practical limitation — but it shouldn’t extend to a recommendation that YOU speak English at home. The BCBA should:
- Support your use of the home language outside therapy
- Not recommend dropping a language
- Refer to a bilingual provider or SLP if available
- Count vocabulary in BOTH languages for assessment purposes
”My child is minimally speaking. Can they really learn two languages?”
Yes. Even children who communicate primarily through AAC, signs, or limited vocalizations can develop bilingual skills. An AAC device can be programmed in multiple languages. Signs can be learned in multiple systems. The question isn’t “Can they handle two languages?” but “What languages do they need to communicate with the people in their life?"
"Extended family only speaks Tagalog. If my child doesn’t learn Tagalog, they can’t communicate with grandparents.”
This is one of the most important arguments for maintaining the home language. The relationship between your child and their grandparents, extended family, and cultural community depends on shared language. Taking that away causes real, lasting harm that no amount of English fluency can compensate for.
Addressing Professional Resistance
If a professional recommends dropping your home language:
What to say:
- “Current research shows bilingualism doesn’t delay language in autistic children. Can we discuss an approach that includes both languages?”
- “Our home language is essential for my child’s relationship with family. I’d like to maintain both languages.”
- “Can you provide research supporting the recommendation to use only one language? I’d like to compare it with the studies showing bilingualism is safe.”
What to look for in providers:
- Awareness of bilingualism research in autism
- Respect for cultural and linguistic diversity
- Willingness to incorporate home language into treatment planning
- Bilingual staff or referral relationships with bilingual providers
- Assessment that accounts for bilingual language development
Frequently Asked Questions
My child was diagnosed at 3 and we’ve been speaking only English since then. Can we reintroduce our home language?
Yes — it’s never too late. Reintroduce the home language gradually through natural contexts: family conversations, songs, books, video calls with family. Your child’s brain retains capacity for language learning. The earlier you reintroduce, the better, but even older children and teens can develop or recover home language skills with consistent exposure.
How should language assessments account for bilingualism?
A bilingual child should be assessed in BOTH languages, ideally by a bilingual evaluator. Total vocabulary (combining both languages, removing duplicates) is a more accurate measure than single-language vocabulary. A child who knows 50 words in English and 40 in Spanish (with 15 overlap) has a total conceptual vocabulary of 75 — not just 50. Insist on bilingual assessment if available.
Will my child be able to learn a third language later?
Many autistic individuals are successful multilingual learners — some excel at it due to strong pattern recognition and systematic learning styles. Don’t assume a ceiling on your child’s language capacity based on their diagnosis. If a third language is relevant to your family or community, it can be introduced.
What about children with significant intellectual disability?
Even children with significant intellectual disability benefit from home language exposure. Communication isn’t only about spoken words — understanding tone, context, and emotional communication in the family’s natural language matters at every ability level. AAC systems can be programmed in multiple languages regardless of cognitive level.
How do I find bilingual ABA providers?
Ask specifically when contacting providers. Use our matching quiz and note your language needs. Contact your state’s autism resource center for bilingual provider lists. Consider telehealth ABA which can expand access to bilingual BCBAs not available locally. Spanish-English bilingual providers are the most common, but providers in Mandarin, Arabic, Tagalog, Vietnamese, and other languages exist in many metro areas.
Browse ABA clinics near you that provide bilingual and culturally responsive ABA therapy services.