I've noticed when changing my 14 month old DS nappy that he had this "odour" coming from his nether regions.
I bath him every night and change his bum frequently and always give him a good wipe down with baby wipes but every time I change his nappy this smell is there.
I've never smelled anything remotely similar with my DD. When I mentioned it to a friend they said boys are naturally smellier down there but another said it was a sign of concern and I shouldn't be bathing him every night? 🤔