In the event of nappy-area redness, wash baby's bottom with a mild, physiological pH product such as XeraCalm A.D. Replenishing Cleansing Oil, then dry thoroughly.
Then use some Avène Thermal Spring Water Spray to reinforce the soothing action.
Finish by applying Cicalfate+ Repairing Protective Cream to soothe and promote the repair of irritated skin. In the case of redness subject to maceration, opt for the Cicalfate+ Absorbing Repair Spray.
If in doubt, ask your doctor or pharmacist for advice.