I am glad that you have put up your query at HealthCareMagic. Nutrition in an infant plays an important role in growth. 6 mnonths of age is appropriate for weaning or introduction of semi-solids into the diet alongside mother s breast milk. In case you have not yet done it, I would insist addition of cereals to the diet. Certain babies have lactose intolerance and cannot digest milk and diarrhea, flatulence (passing gas), and abdominal pain occur. Abdominal bloating, abdominal distention, and nausea also may occur. The information that you have provided is inadequate to make the diagnosis certain. Lactose intolerance can be diagnosed by eliminating lactose from the diet, milk challenge, breath test, blood glucose test, stool acidity test, and intestinal biopsy. Avoidance of milk and milk-containing products can lead to a dietary deficiency of calcium and vitamin D that, in turn, can lead to bone disease (osteoporosis). Zerolac is a milk formulation containing no lactose and may be tried. If I had a patient like your baby, I would have not suggested Cyp-L which contains a drug called cyproheptadine which is supposed to act as appetite stimulant. But it is not proven to be effective and has a sedative action. I would suggest you to consult some pediatrician before deciding on the intervention.