How long does it take a child to become fluent in a new language?

It depends mostly on how much of the language your child hears and uses each day. Children who are immersed, for example attending school in the new language, often manage playground conversation within a year or two, but research finds full spoken proficiency takes about 3 to 5 years and academic fluency 4 to 7 years. Children who only have a couple of lessons a week will take much longer to become fluent.

Two kinds of fluency

Language researcher Jim Cummins distinguished between two levels that develop at different speeds:

• Conversational fluency: chatting with friends, playground talk, everyday needs. It relies on context, gestures and familiar topics, so it comes faster.
• Academic fluency: understanding a science lesson, writing an essay, following complex instructions. It needs specialist vocabulary and grammar, so it takes much longer.

A Stanford study of English learners in two California school districts considered among the most successful found that oral proficiency took 3 to 5 years to develop and academic English 4 to 7 years, and the authors said these may be underestimates (Hakuta, Butler and Witt, 2000).

This is why a child can sound fluent on the playground but still struggle in class. Both are normal stages.

Typical timeline for a child immersed at school

Children learning a language only through weekly lessons, without daily use, usually progress much more slowly than this.

What speeds it up

1. More hours of real use. Vocabulary grows with how much of the language a child hears (Pearson et al., 1997).
2. Speaking, not just listening. Children who only listen can understand a lot but struggle to speak.
3. Strong first-language skills. Reading and reasoning skills carry over to the new language.
4. Interest and confidence. A relaxed child who wants to talk about something learns faster than an anxious one.
5. Reading in the language once your child can read.

Does age change the timeline?

Older children often make faster progress at first because they can read and already understand how language works. Younger children usually end up with more native-like pronunciation because they have more years of exposure. See What is the best age for a child to learn a second language?

Adding daily speaking practice

For children who are not immersed, the gap is usually daily speaking time. Askie, a voice-first AI companion for ages 4 to 15, can talk with your child out loud in the language they are learning for a few minutes a day, starting at their level and talking about what they love, and you can read every conversation afterwards. It does not replace people or school, but it adds speaking time that many children otherwise do not get.