This diaper rash cure is 100% guaranteed to work. I have three girls and they have all
gone through the nasty diaper rash phases!!!
First rinse all your wipes thoroughly before using them on your baby. You don't have to get the expensive name brand wipes, but I do recommend using the "sensitive" type (they just seem to hold up better), and I don't recommend Huggies, ever (not the brand name or generic....they always seem to fall apart and leave fuzzies). My personal preference is Target brand sensitive, but if you don't have a Target, Walmart brand sensitive wipes are good too.
So at each diaper change, use rinsed wipes. Pat as much as possible, don't rub unless it's absolutely necessary (sometimes you just have to with a poopy diaper!), but be gentle!!!
This next step is KEY..... use a hair dryer to dry her bottom. Set it on low heat, keep a hand near her bottom at all times so you can feel if it ever gets too warm, and keep the dryer moving back and forth so it never sits in one spot too long. But use the dryer for at least 5 minutes with each change.... longer, if you have the time! Drying out the diaper rash is the easiest and fastest way to cure it.
Finally, don't use creams! Especially if baby has open sores or blisters on her bottom!!! The creams just get inside the sores and blisters and tend to make the rash way worse before it gets better! Use plain vaseline. Do not apply the vaseline until her bottom is completely dry, and cooled a bit after the hair dryer, or you'll just keep the rash going (I usually just use the cool shot with the hair dryer). Diaper rashes thrive on warm moist places.
This is a 100% cure. We've never had a diaper rash last longer than two days since I figured this all out!
One thing to keep in mind though is that your baby could be allergic to the diapers you're using. Like niknak said, you might try changing brands, too.