One of the joys of practising in Mersin is that no two children in my clinic share the same language map. I see children who speak Russian at home and play in Turkish at the park, children who hear Arabic lullabies from their grandmother and sing Turkish songs at nursery. And almost every one of these families asks me the same question at the first meeting: "Did two languages confuse our child?"

In this article I'll give you the research's clear answer — and take apart, one by one, the well-meaning but wrong advice these families keep hearing.

The short answer first: bilingualism does not cause delay

The scientific literature is unusually unanimous here. Children growing up with two languages say their first words in the same period as monolingual peers — around 12 months — and start combining two words within the same window — around 24 months. The brain doesn't treat two languages as a double burden; it runs them as two systems, and it does so remarkably well.

So why is the "bilingual children talk late" belief so widespread? Because there's a genuine illusion at work. Let me explain.

The counting mistake: not adding up both lists

If you measure a bilingual child's vocabulary in only one language, you undercount. If the child says "вода" for water in Russian and "top" for ball in Turkish, that's two words — not one. When you count what specialists call the conceptual vocabulary — the total across both languages — bilingual children keep pace with their monolingual peers.

That's also where the illusion comes from: the nursery teacher only ever hears the child's Turkish; the grandmother only hears the Russian. Everyone says "she speaks so little" from their own window — but nobody sees the whole picture.

"He mixes the languages, so he must be struggling"

Quite the opposite. Using words from both languages in one sentence — "Mama, the ball упал!" — is called code-mixing, and it's an entirely ordinary part of bilingual development. Bilingual adults do it too, often finely tuned to which languages the listener knows. Mixing is a sign of juggling two systems competently, not of confusion.

The most damaging advice: "Speak only Turkish at home from now on"

Families who hear this usually cut back the home language believing they're doing the right thing. Two things get lost at once.

First: children learn language from rich, accurate models. A mother speaking her strongest language plays with words, jokes, tells stories; forced into a language she half-knows, she shrinks into short, formulaic sentences. A weak Turkish model teaches less than a fluent Russian or Arabic one.

Second: the home language is also the language of emotional bonds. The chats with grandmother, the family songs — half of a child's identity lives there. And I can say this with full confidence: don't worry about Turkish. Nursery, school, friends and the street will carry it, in every case.

Dropping the home language doesn't speed up Turkish; it only shuts down the child's richest source of language.

So how do you spot a real delay?

So far I've been saying "relax" — now for the balance. Bilingualism doesn't cause delay, but it can mask one: "it's because of the two languages" can become the same kind of months-eating excuse as "boys just talk late". The following signs are about development, not language choice, and they're judged across the total of both languages:

  • Fewer than 10 words across both languages at 18 months
  • No two-word combinations in either language at age 2
  • Not turning to look when called by name
  • Weak non-verbal communication too — gestures, shared attention, pointing
  • Comprehension behind age level in both languages

A true language disorder doesn't hide in one language; it shows itself in both.

A few principles that make home life easier

  1. Everyone speaks the language they're most comfortable in. "One parent, one language" can work, but it isn't a requirement; quality matters more than strict consistency.
  2. Keep books and songs alive in the home language. They are usually the child's richest source of input in that language.
  3. Don't correct the mixing. Quizzing a child with "now say it in Turkish" dampens the joy of talking.
  4. Let social life deliver the Turkish. Nursery and playgroups are the most natural Turkish teachers there are.

If a question mark remains

When I assess a bilingual child, I take both languages into account — collecting detailed observations from the family about the home language and reading the picture as a whole. If you don't want to settle for "it's just the two languages", a short intro call is a good place to clear things up together.