You do not mention your son's age. Is he still a young baby? If so he may simply have colic and may not be allergic to milk.Has he been tested for cow's milk allergy? Many babies become constipated when given a soya formula. Isomil1 is one of the best soya formulas and it will not help to change to another soya formula.If your son's milk allergy is,or has been confirmed on allergy testing he will need to go onto a low allergy formula such as NAN HA. If his milk allergy is severe he will need Similac Alimentum.
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