STinky arrmpits?

tmp-9178578

didnt know where to post this but my 19month girl has smelly armpits.Its like a grownn boy running around all day type smelly ordor.This has me kinda worried for as she shouldnt have a BO at that young age.Her older brother whos 4 has no smell.We have a dr visit on the 4th so i will be bringing this up.My baby girl has been through soooo much already i praying its nothing too serious.Anyone experienced this?