Your baby son's weight is well below the average weight for a baby boy of 7.5months which is 8.5kg. I presume that his combined lactose intolerance and acute nephritis problems are the main reason for his low weight. He is definitely drinking far too little milk. Babies with acute nephritis should be under the careful supervison of a qualified dietician. Your baby's protein intake has to be carefully monitored. Please ask your paediatrician to recommend a dietician.
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