You may need to use rice milk if your little son is not able to tolerate soya.The other alternative such as an amino acid formula called Neocate is very expensive.His weight could simply be a family characteristic ie tall and slim men in the family or could reflect his milk allergy. Incidently your baby can be tested for allergies now there is no reason at all to wait until he is 2 years old.Allergy tests can be done from birth onwards.
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