This is a difficult question to answer because there are several possibilities that may explain your baby's symprtoms.He seems to be allergic to Lactogen, but I am at a loss as to why he can tolerate the S26 if he is allergic to the Lactogen which is also a cow's milk formula.He does not appear to have a lactose intolerence problem as he can tolerate other milk formulas and also does not appear to be refluxing as he is fine on S26.
You should not add milk of magnesia to your baby's formula.He should stay on Novalac IT as this was helping his constipation and give him more in the way of solids if he is hungry.
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