Why is this even happening?
Your child uses the language material that is available to him most quickly. If the desired word pops up more easily in English, it will insert English. If the Russian design is more convenient, it will take it.
This does not necessarily mean that your child “loses his tongue.” More often, this suggests that both languages are alive, but distributed across different situations and topics.
When it's normal
Mixing is especially common in children who grow up in two languages at the same time or are rapidly immersed in a new environment. For a bilingual, this is the usual path: he is still learning to share which language is more convenient and how to switch between them.
If your child generally understands both languages, can communicate, develops and gradually builds up the vocabulary, the confusion itself should not be frightening.
When you need to take a closer look
If one language sags noticeably: your child almost stops speaking it, greatly simplifies phrases, avoids reading and any longer speech, then it is not the confusion itself that matters, but the fact that the language begins to go away.
In this case, it is not the ban on mixing that helps, but the strengthening of the living environment: reading, talking, lessons and situations where Russian or English again become full-fledged working languages. If a child often inserts English words because there are not enough Russian, look at the material. vocabulary.
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