DS is bilingual: one parent, one language. He is 7 months now. I had noticed around 4 months sounds like "ga" "go" and "gee" but now there is nothing. Just vowel sounds like "ah" "ooh" which are more like grunts and squeals. I know he was later than other babies his age to blow raspberries, and he doesn't recognise his name - I think, as he looks at me if I use someone else name as well.
When did your bilingual child start to babble? Should I be concerned?