1Hello how are you. The child is 18months old and is weighting 10kg. What was his birth wt? I feel good wt for 18months old. Why you adopted bufflow milk? It is thick milk. Tone milk or ciw's milk is alright. Donotgive heavy milk. They put on wt .Later on are candidates of metabolic syndrome, andHBP, DM, AND MANY MORE DISEASES. .NOW YOU GIVELESS MILKAND MORE OF CEREALS. Start any thing rice, idli, rava, you can give dal without masal. Banana apple, green veg. Start with one item smallquantity, slowly increase in quantity, and add a second item every week.contuing all previous food items. Banana is good food. .energy , nutrients , minerals and antioxides , fiber, probiotics. So start with banana.Continue it even during episode of cold and cough. Till now we have notdocumented any case of allergy to banana. I have already given you an idea to start with small quantity and increase it. Institute an one item every week. Problem of constipation will be solved in your child's case. Cottage cheese is good but not processed cheese. So you can give cottage cheese- home made or fresh reliable from outside.. your weight problem and constipation problem is solved. No medicine required .max give m ultivitamin drops..