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She could be having an enzyme deficiency in the body called Lactase. This could be a condition called Lactose intolerance
which causes the above mentioned symptoms including abdominal bloating
, weakness etc. You have done a right thing in switching the milk formula. She may need to avoid all sorts of food with lactose milk such as ice creams, diary products as well. The fact of the matter is that isolated lactase deficiency
causing symptoms is rare in children and there could be inflammatory bowel disease
which can be a secondary cause of this problem. This is why it would be best if you get him checked up by his Paediatrician and also get stool examined to find out if it is only lactase deficiency or associated other digestive and bowel problems as well.She will need calcium supplementation as she cannot take normal milk products. There are lactase supplements available to prevent the severity of such response to lactose food as well. Kindly discuss the options available for your daughter with her Paediatrician.