Talk to Endocrinologist on Congenital Hypothyroidism

Salam. My son is 18 days old infant. He has been diagnosed as a thyroid patient with low T3 and T4. He is taking a pill of thyroxine 50mg daily. He is allergic to formula milk. He start vometting and hungry every time. Some time he is allergic to mother's milk also. Kindly suggest me any good formula milk with as the baby is allergic to formula milk. But requires external feeding.