well I don't have a little girl (yet!) but I found this online
When it's time to wash the diaper area, remove her diaper and sponge off the skin on her belly and bottom. Usually babies' genitals need only gentle cleansing. For little girls, wash from the front to the back. Don't be concerned if you see a
white discharge or vaginal bleeding. These are both normal for
newborn girls, and the discharge does not need to be wiped completely away. Leave whatever does not come off with one gentle pass