This is most unusual behaviour especially for a boy. It is of concern that he is underweight and his growth is stunted yet he has no appetite for food.He does like some sugar rich drinks but Pronutro and veggie bites are not junk foods.It would be best if he was seen by a paediatrician first just to sure that he is a healthy boy as there are certain conditions where children have very poor appetites. Only once you know that he is well can you try an appetite stimulant such as Longifene syrup.
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