First thing first is to treat the rash. The doctor will prescribe an anti-fungal cream to apply to the rash. I am familiar with using Nystatin twice a day for seven days. However, yeast can develop an immunity to prescribed antifungals. Also, for those using cloth diapers or those wanting to take a more natural approach, you can make your own anti-fungal cream that is both natural and as far as I've experienced, cloth diaper safe.
The only issue I have found with this solution is grapefruit seed extract can cause the skin to become very dry. Perhaps alternating coconut oil with the extract and then without the extract can help re-moisturize baby's skin or using shea butter after the natural ointment could help. Also, if baby is at least six months, you could add in a few drops of tea tree oil for an extra oomph.
One of the most important things when dealing with a yeast rash is to treat anything and everything the yeast comes in contact with. That means the changing pad cover, the diaper, the baby tub and anything else that has touched baby's tush. To treat these things, wash them in the washer with 15 to 20 drops of grapefruit seed extract. Vinegar in the rinse cycle can help too.
Do you have any other tips on treating a yeast rash naturally?