diaper rash! TMI (possibly)

kirsten • Married for 4 years. Currently have a one year old princess💜 and a 1 week old prince💙
what do you use for diaper rashes? I have been using desitin because we have an abundance of it but its not working as quickly as I would like. My little one doesnt really have a rash; just between her butt-cheeks is red.