We're an already bilingual household, neither of which is English. Parents speak the primary language, and grandparents speak the secondary language (who visit frequently and babysit)
Our son (21 months old) is conversational in the primary language and understands the secondary language well, with age appropriate extent of vocabulary of course. He's speaking in broken sentences now, and sometimes full grammatical sentences of the primary language. I think he picks up language fast though I may be biased.
We were planning to send him to daycare starting at 15 months, and have them be in charge of introducing English. But COVID happened and day cares have all been closed. He has had no exposure to English. Daycare and playschool will probably re-open when he turns 2, and I'm afraid other children at this age will already be speaking or at least understanding English, and he'll feel left out/behind.
What I'm trying now is to speak to him in English when we are out and about (park etc.). It comes naturally too, because others there speak English as well. He seems to understand simple things like "this way or that way?" "run" "lets go". But this is at the most 2 hours per day.
Can I introduce English at other times or other ways that'll be more affective? Is 21 months too old to add a 3rd language naturally?
For the purposes of this question, we can be considered to be living in an English speaking country. We're in India, so not English speaking per se, but we live in a metro city where people's language of communication defaults to English, due to the lack of a common regional language. Neighbors, schools, they all speak in English. To the point that parents have taken to speaking in English to their kids from the very beginning. We didn't want to do that and hence my fear that he'll feel left out when he goes to play school and all his peers already know English.