My daughter had tough spell with that too. We changed a couple of things - her diet, extra effort to change her diapers the moment she'd done anything in them... we tried a bunch of different brands, but she did clear up faster when we changed to the chlorine-free type. Seventh Generation Chlorine Free Baby Diapers 
cost pretty much the same as all the others, especially when I stay organized enough to order them ahead of time online. It's so much hassle to bundle up the baby to go to the store. And even moreso now that the weather's getting cold. My husband & I also like the feeling that we're improving the health of our daughter & the planet at the same time.
