3 year old son he speak only fews words like,papa,mummy,bhaiya,didi,dada,mama,nana,nani,do ggy etc.he seems to be very slow in learning things as compare to others children's.he has started gng to play school,his teachers say he is improving day by day,but I'm wondering what will gng to happen with him.he doesn't play with blocks.he play with other musical toys.