i think one important thing is that he IS active. i was a much larger kid when i was younger (5'6 - 180+) and was still very active. as long as you teach him good habits thats a great start, his body will grow and lengthen which requires a lot of calories which it may be storing as fat now, at least thats how it worked for me. So teach good habits, keep him active and watch puberty transform him.
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