The incidence of labial fusion in children.

A retrospective study of 9070 female infants born at the Foothills Provincial Hospital was conducted to determine the incidence of labial fusion at birth. A prospective study was also conducted on 1970 female patients assessed through a paediatric outpatient clinic to determine the incidence of labial fusion in this population. None of the newborn infants had labial fusion. Thirty-five children (1.8%) assessed at the paediatric outpatient clinic were found to have labial fusion with a peak incidence at 13-23 months of age (3.3%).