Boudreauxs Butt Paste offers soothing relief for diaper rashes. It has 16% zinc oxide and Peruvian balsam that act as a protective coating on your babys sensitive skin. This baby diaper rash ointment has a pleasant fragrance and can be spread on and cleaned off easily. Â It"s available in a convenient 2.0-oz. tube with a flip cap. For newborns and up.