Similac Total Comfort is indeed a good formula. It contains a lower than average level of lactose and usually helps for babies who have some degree of lactose intolerance especially for babies in their early months. Now that your daughter is 13 months, she may well be able to tolerate a normal formula. You can certainly try her on the Similac advance 3 formula now. Hopefully she will tolerate this formula well, but if you see that she becomes constipated (unlikely), she will have to change back to the Similac Total Comfort 3
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