My dd is 6 and she mentioned to me that her armpits smelled, I checked and they do have a slight sweaty smell. It happened when the weather was very hot and she'd been active, I have noticed it another couple of times but not all the time it's not the type of body odour you'd smell from a distance I have to actually smell under her arms to smell it but I'm a bit concerned that she shouldn't have smelly sweat at 6 years old. Is it something I should be worried about?