If someone has ever told you to stick to one language with your child so they don’t get confused, here’s the direct answer. That advice isn’t supported by the research, and following it can actually do more harm than good. This is one of the most persistent myths in early childhood development, and it’s worth clearing up properly, because a lot of families end up making decisions based on it that they later regret.
What the research actually shows
The American Speech Language Hearing Association, the Canadian Paediatric Society, and decades of peer reviewed studies all agree on the same basic finding. Bilingualism does not cause language delay. Children raised with two or more languages reach major milestones, babbling, first words, first phrases, on roughly the same timeline as children raised with one language. This holds true even for children with existing developmental differences, including autism, where research specifically shows that being raised bilingually does not add extra delay on top of what’s already there.
Where the confusion usually comes from is vocabulary counts. If you test a bilingual child in only one of their languages, their vocabulary in that language will often look smaller than a monolingual child’s. But that’s measuring the wrong thing. When you count a bilingual child’s vocabulary across both languages combined, it lines up with monolingual peers. The words are all there, they’re just split across two systems instead of one.
What’s actually normal in a bilingual toddler
A few things that worry parents are completely typical and not signs of a problem. Mixing words from both languages in the same sentence, sometimes called code mixing, is well documented and normal, not a sign of confusion. It often just means the child reached for whichever word came to mind first in whichever language offered it. A slightly smaller vocabulary in one language compared to a monolingual peer in that same language is also expected, and evens out when you look at total vocabulary across both. And a temporary quiet period when a child is first exposed to a second language, sometimes lasting a few months, is a documented and normal part of the process for some children.
When it’s not about bilingualism
Language delays do happen in bilingual children, the same way they happen in monolingual children. The key point is that bilingualism itself isn’t the cause. If a child is showing a real delay, meaning the same signs that would raise a flag in a monolingual child, no words by 18 months, no word combinations by two and a half to three years, or very limited understanding, that delay shows up across both languages, not just one. It’s not something that switching to one language fixes.
If you do have concerns, the most useful thing is finding a speech language pathologist who can assess your child in both of their languages, not just the majority language. Testing only in English, for a child who speaks mostly Punjabi at home, will make a perfectly typical child look delayed simply because the test isn’t measuring their full language ability.
What actually helps
Keep using your home language, fully and confidently. Reducing or dropping it doesn’t reduce delay, and there’s no research showing it helps in any way. What it can do is limit the quality and amount of language your child hears overall, especially if English isn’t the language you’re most comfortable and expressive in yourself. Children learn language best from rich, natural interaction, and that happens most easily in whichever language feels most natural to you as a parent.
Common questions
- Does raising a child bilingually cause speech delay?
- No. Bilingualism does not cause language delay. Children raised with two or more languages reach major milestones, babbling, first words, first phrases, on roughly the same timeline as children raised with one language.
- Should I stick to one language so my child is not confused?
- That advice is not supported by the research, and following it can actually do more harm than good. Keep using your home language, fully and confidently. Reducing or dropping it does not reduce delay, and there is no research showing it helps in any way.
- Is it normal for a bilingual toddler to mix both languages in one sentence?
- Yes. Mixing words from both languages in the same sentence, sometimes called code mixing, is well documented and normal, not a sign of confusion. It often just means the child reached for whichever word came to mind first in whichever language offered it.
- Why does my bilingual child’s vocabulary look smaller than their peers’?
- If you test a bilingual child in only one of their languages, their vocabulary in that language will often look smaller than a monolingual child’s. When you count a bilingual child’s vocabulary across both languages combined, it lines up with monolingual peers.
- How should a bilingual child be assessed for a language delay?
- The most useful thing is finding a speech language pathologist who can assess your child in both of their languages, not just the majority language. Testing only in English, for a child who speaks mostly Punjabi at home, will make a perfectly typical child look delayed simply because the test isn’t measuring their full language ability.
Sources cited in this guide: the American Speech Language Hearing Association, the Canadian Paediatric Society, and decades of peer reviewed research on bilingual language development.
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