early puberty?

So I have a six year old daughter. About a year ago she started developing body odor, specifically on her armpits. Now she's getting a few blackheads on her nose. I feel like she's way too young to be experiencing this. I spoke to her pediatrician and he wasn't much of a help. I'm going to take her to get seen by another pediatrician, but I want to see if anyone has experienced this with their children?