baby is just 3 months 5 days. he looks at us, responds, coos and smiles from 2.5 months. but last 2 days he's doing dis wenever he's in good mood. if v talk to him he doesn't see us everytime. sees in between n smiles.. sometimes starts conversation. most of the times he plays looking here and there. he tracks moving objects also sees us moving in room, reacts to loud noises. looks at rattles and sounds. worried about his eye contact with us when v talk to him. most of the times hes busy looking other side or things. is this normal?