Women’s labia are not very symmetrical on both sides, many people are asymmetrical, that is, there is a side of the big, a side of the small, so 13-year-old girl labia development on one side, there is no need to worry about, with the age of the other side of the increase will gradually develop, but there may be a development of smaller, do not have to worry about it, this is a normal phenomenon, this situation does not affect the sexuality, and also does not affect the pregnancy, the body will not cause any effect. Most 13-year-old girls have their periods, so as long as they have their periods normally, they are developing normally and it’s not a big problem.