It is very possible that your baby is highly allergic to her NAN1 formula which is a cow's milk formula. She appears to be very allergic so it probably will not help to change her to NAN HA which is only slightly modified and is not suitable for babies who are very allergic to cow's milk.The best formula for your baby given her history of prematurity is Similac Alimentum. This is quite expensive but should suit your baby. If it does not then she must be seen by a paediatrician, preferably a paediatrician with experience in paediatric allergy.
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