I've noticed a few times recently that after a busy day with a lot of running around that DS1 is a bit whiffy under the armpits. I guess I need to nag him a little more about washing thoroughly under there but I'm also wondering if I should look into getting him some deodorant.

He's only 7 so I wasn't expecting this yet
Does anyone else have a child so young with grown up smelling sweat?

Also, what is a really gentle deodorant? I use the strongest I can find and bugger the chemicals so I have no idea about low chemical options.