If you're wanting to use over the counter diaper rash treatments and creams you should give Boudreaux's Butt Paste a try.
The Boudreaux's Butt Paste has worked great on my nephew when he has had diaper rash and it clears it up quickly and has prevented diaper rash on him.
You can also apply some baking soda and water paste to your babies diaper rash which can get rid of diaper rash naturally and quickly.