How to clean a baby girl’s private parts – paediatrician-approved steps How to clean a baby girl after pooping and during every diaper change. This is the correct way to maintain newborn girl hygiene safely. Step 1: Lay your baby down comfortably and remove the diaper. Step 2: Use clean cotton or a soft cloth dipped in plain lukewarm water. Step 3: Wipe gently from front to back to prevent urinary infection. Step 4: Clean only the outer area you can see; never separate the labia. Step 5: Repeat