4.5 month old. rolled over. reaches for objects when shown to him. turns to sounds all the time. turns to voices sometimes. good eye tracking. good eye contact in lie down position. social smile and laugh.. but when held in hands he gives eye contact only few times that too brief. immediately looks arounds. same when placed on my lap.. am worried about this eye contact thing when held or put on my lap.. is it normal??? please help me out of this