It is obvious that your baby became very constipated when given Lactogen and the Similac is also aggravating this problem. If your wife is now able to do so she should exclusively breast feed your baby for as long as she can, 6 months being the shortest period. There is the possibility that your baby is allergic to cow's milk and you will need to be careful about choosing a low allergy formula when the time comes to wean her off the breast.
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