My daughter is almost 6 months old now and for the last couple of weeks she's been vomiting up formula on a regular basis. She's had the same formula, Infamil, all along without any problem. She holds down food and juice just fine. I thought she might have a flu or something but she's looked and acted fine except for the vomiting directly after drinking the formula and this has gone on for two weeks now. Could she suddenly develop lactose intolerance? Maybe its something else but this just seemed like a good starting point.