The average weight for a 4 month old baby boy is 7kg.You have not mentioned your baby son's length as he may just be a very big boy. His weight is on the 90th percentile line of the infant growth chart which means that his weight is in the top 10% for baby boys of 4 months.Do not change his formula. He should remain on the NAN1. Do not start him on solids until he is 6 months old.
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