Our Otis had a bad case of Candida on his belly a couple of summers ago after playing in the pool - we washed him, and used peroxide - but that didn't seem to work. I contacted my breeder, and she suggested Miconazole Cream - I had no idea what that was, so I went to the local CVS and asked for a tube of Miconazole, and she gave me Monistat! DUH.. why didn't I think of that!!
I bought a tube, and applied it VERY sparingly to a tiny area (because he has VERY sensitive skin), and it started to heal - I then used it regularly until his Candida cleared up. After some research, I found that Candida can be caused by diet, so we switched him to a Raw Diet (Nature's Variety) and haven't had to use the Monistat in a while.
And it goes without saying - but PLEASE check with your vet first if she/he would recommend that for your baby.
Lots of luck - Hope Mojo feels better