Similac Alimentum is an extensively hydrolysed and modified cow's milk that is usually recommended for highly cow's milk allergic infants.It is very rare indeed for a baby to have a reaction to this formula.It certainly seems that your baby is indeed highly allergic to cow's milk as shown by his reaction to the NAN HA formula.The soy formulas are indeed a popular substitute formula for cow's milk allergic infants. Phytoestrogens in soy formulas have been extensively studied and are considered to be safe,but this evidence is not with complete 100% certainty.
Your best and safest option would be to express your breast milk for your baby while you are away at work.
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