my ds will turn 6 months on tuesday, may be i am hormonal or just being crazg mamma, but as ds is on thyronorm tablets i am very concerned about his weight and physical milestones. ds cannot hold his head in front when i try to make him sit in my lap with his back supported on my chest. he cannot keep his spine straight and after seconds will fuss to lie down. i am crying while typing this but he has not even doubled his birth weight. husband is adamant to follow doctors instructions, and ourr next visit to specialist doctor is not before may end. please help if possible.