My bub is 5 months old. He responds to his name 70% of the times. He does social smiling well. Tracks my movement across the room.. makes wonderful eye contact. And reaches all his milestones. He rolls over both sides . Passes objects form one had to another . My concern is he scratches surfaces like play mat and couch. I am very concerned. Is this a normal behavior.? Can someone help me. Is this autistic behavior?!