I have a 2,5yo who talks English and Hebrew. He is meeting the milestones for his age in both languages as far as I can tell, but I'd guess he is in the bottom quarter as far as language development goes. That is, I saw many children his age who speak much better. He started off talking in English as we lived in the US, but we now moved to Israel for a year. In the last few months we have been trying to get him to learn as much Hebrew as possible for the kindergarten (my husband is a native speaker of both languages and I am fluent in both). Next year he will be back in English speaking environment, so we also try to talk to him in English. For now he often mixes two languages.
I'd really want to start talking to him in my native language(Russian). I haven't done so before because I felt weird talking to him in the language that my husband and surroundings don't understand. The question is if I should start now or let him learn his Hebrew better and start at age 3+ when he is back in English preschool? I would appreciate any experiences you might share.