my baby is 5 months old. his pediatrician during his birth had suggested multivitamin and calcium supplements to be given for 3 months. but we have continued to give them uptill now. so uptill when can we continue to give them further? one more question... there is a very dry patch on his scalp. its very itchy and irritating. when he scratches it, small dry skin pieces come out of it. we apply oil to his head regularly. what it can be? how can it be cured?