The average weight for a boy of 4 years is 16.5kg. Your son's weight is obviously below this average weight. His weight is on the so-called 25th percentile line of the children's growth chart. This puts him in the lowest 25% group for 4 year old boys. If he eats well and appears to be healthy there is no need for great concern. He may simply be following a family pattern where the boys and men in the family tend to be rather thin, but are healthy otherwise.If this is not the case and you are concerned about your son's appetite, health and his weight then it would be best to ask your doctor to examine him and see that all is well.
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