Our expert says:
As cf says, much depends on a complex bundle of factors, including the size of yourself and his dad, and the usual size of people in both your families. You'll need to keep checking with your GP to be sure he has both identified that there is a really significant lack of weight here, and that he has ruled out physical illnesses as a cause. Personally, I would not use any drugs in treating an underweight child ; I'd even hesitate about using vitamin supplements. Ask the doctor ( and, separately, your best local pharmacist ) what drugs these are and what they are being used for.
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