I just saw the thread in parenting about someone whose ds is getting pubic hair aged 7 and it reminded me:
today ds1 (aged 10) had been playing in the garden and when he came in, he smelt very sweaty in a teenage, body odour sort of way. He has never done so before and I wondered if this was a sign of puberty. He is very young still, not at all physically mature for his age (he is only just 10).
When did your ds start smelling sweaty?