How much is he eating for each meal?
Personally, I feel that as long as he is having sufficient and well balanced meals, then there is no need to be too worried about the number of meals he is having.
Another way is gauge would be that he is still full of energy and active while awake, and not showing signs of lethargy. Also, not falling ill frequently is a good indicator that he is healthy and growing well. Hence, there will be no need to be too worried. Getting enough rest is important as well. :)
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