If your baby has a severe diaper rash with redness and small red burns, there are some things you can do while waiting to see a doctor. First, try to minimize the causes of irritation, such as loose stools and ill-fitting diapers. Let your baby's skin air out as much as possible and use well-fitting diapers, changing them immediately after urination or bowel movements. You can also apply zinc oxide or petroleum jelly to create a protective barrier on the skin. If the rash persists despite these changes, it may be due to an infection, in which case an antifungal cream could help. If the rash still does not improve, speak to your pharmacist about a cortisone cream and consider consulting a doctor.