A complex question, but the two issues are that your baby has two problems at present; she is lactose intolerant (proven) and has what seems to be very severe reflux. She cannot tolerate any formula that contains lactose and equally cannot tolerate any kind of thickened agent added to any formula that is used for reflux, because she cannot tolerate the thickening agent (usually corn starch) which is a very common problem. So she needs a low lactose comfort formula and here Similac Total Comfort (not Alimentum) is recommended. Then she needs a medicine to lower her stomach acid which is causing her discomfort, so she must stay on the Nexiam which is safe and effective. Do not give her Motilium as it is no longer recommended.
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