Thank you. You have made an excellent observation. Your little son's chest shape may be due to him having had more than one quite definite chest infection up to now or may be due to him having had a blocked nose for quite a long time.Another possible cause is a vitamin D deficiency. Of course your son may not have had any of these conditions and the actual cause of his chest shape is not obvious and may simply run in the family.The average weight for a 16 month boy is 10.6kg.
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