My son is of around 2 years now. Although in some areas he seems to be developing normally... like he runs by own, he moves on stairs with support, he understands toys and plays with it normally, he understands well that the thing he wants is there with him or not, can try to find if hidden and put in his notice. But, seems weak in language milestone. Did not start understanding common words used in talking like give, take etc except come and go. Did not start speaking easy words for his age and did not start follow simple instructions. More inputs: Does not have very good environment of playing with group of kids. Is it alarming for us? What should we do? Please suggest.