I had a professor who was well known in the area as he consulted different facilities re complicated issues. He used to say that he could look at a baby and his/her parents and how they interact and say if the child will have learning (especially language based) or other difficulties (including emotional) growing up. Only that much of it is genetics. The rest is nurture. Of course I think he exaggerated a bit to make a point but a lot could be said about child’s future based on how parents interact with an infant