If the little girl has symptoms such as pain, or trouble passing urine, it may indicate that her labia can be stuck. It is not clear why some girls develop labial adhesion. Girls normally have low levels of estrogen and vulvar irritation which can cause labial adhesions. Labial adhesion can develop as early as 6 to 8 weeks after birth. Baby girls who have just been born have high levels of estrogen passed on from the mother during pregnancy so are not prone to adhesions.
In some cases, adhesion happens when the labia become irritated and raw, possibly from wet or dirty diapers or scented detergent and soap. In most cases, medical intervention is not required.
Trying to pull the labia apart can be painful and is best left alone. If the adhesion extends to cover the opening of the urethra and is trapping urine in the genital area it can lead to urinary tract infections. The doctor needs to be consulted in such cases.