Your baby son's weight is good and is almost on the average for his age, so with him being 4 weeks premature you have done well. Something started worrying him at around 5 months. The most likely cause is teething as his teeth have not appeared yet but the first actual signs of teething probably occured at about 5 months.His main source of nutrition should be his milk, not solids.he may not like the taste of his present formula and it is worthwhile thinking about trying another formula that he may prefer.
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