It may seem odd, but the genital tissues of young children are quite prone to getting stuck together.
Many girls are prone to labial fusion or adhesion.
Both foreskin adhesions in boys and labial adhesions in girls are something many doctors unnecessarily feel compelled to manually tear open, causing needless pain. Most often they just seal up again anyway. So long as the adhesions are incomplete - meaning there is still enough of an opening to allow free flow of urine when voiding, they cause no harm and treatment of any sort is unnecessary. Younger doctors more often will use estrogen cream for labial adhesions in girls. I worry about possible effects 20 or 30 years down the road, however, which of course hasn't been studied.