Good morning . Yes this is a tough phase of parenthood . But we have to understand one thing, it takes a lot of effort to discipline a child of this age, so we have to be very patient . Understand the nature of your kid understand his taste preferences . Try to inculcate the habit of having fruits. See which fruits he likes . Yes pediasure is a good supplement you can give . Would you be kind enough to give me the details of the kids present height and weight along with her birth weight. Does the child gets sick often and if yes , was she hospitalised ever??? Cos regular infections hamper the growth.