My baby is 2 years and 6 months old. She remains in her own world. if we ask her something, most of the time she doesn't care to respond. if we shout at her (sometimes), then she responds. She communities with us when she wants, but most of the time she doesn't responds, remains busy with whatever she was doing. Probably this is a normal behavior of kid. can someone plz suggest, do i need to do something about it.