Your son's weight for a baby of 14 weeks is slightly below the average falling on the so-called 25th percentile [the lowest 25%] for baby boys of his age. However this is not a problem at all as he is not in the categories of weight for his age where one would be really concerned.This may simply be a familial tendency as you suggest. Your baby seems very happy and is contented so there does'nt seem to be any cause for concern.
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