My son 9 month old. He weighs perfect as per his age. He eats solid and breastfeeding well. Suddenly went to video on autism I got worried. My son sits well also try to hold someone or chair or bed to get up. My concern is he still doesn't respond to his name since he has many nicknames but he doesn't look to anyone when called. He does laugh when we laugh or try to make him laugh. He cry sometimes extremely but Console as soon as we take him out. Hasn't strt speaking anything yet. Is it normal?