Don't use baby wipes. Use plain water. If possible, use a bulb syringe and just rinse it off, then pat dry with a tissue. Give her a warm bath with baking soda in it 3 times per day. Give her as much time without a diaper or cream as possible, preferably outside if it is warm for a few minutes in the sun. Change her as soon as she is wet or dirty. With every diaper change, use a thick white cream - I like the natural Boudroux Butt Paste in the green tube - and then cover that with A&D ointment as a barrier to keep the urine and poop from touching the skin. if it is really bad and those things don't clear up in 3 days it may be a yeast rash, so use lotrimin cream (from the grocery store for athletes foot or jock itch - don't need a specific baby kind) three times per day instead of the other creams. Also, consider a probiotic for the baby. Culturelle makes a gluten and dairy free powder you can mix with either milk or water. If that doesn't work or the rash is bleeding or flaking, call your doctor.