There are individual differences in the development time of the labia majora, which generally start to develop at around 12 years of age and become fully open at around 15 years of age. The female vulva generally starts to develop faster from about 12 years of age, and gradually develops from an infantile type to an adult type, which is manifested by the gradual bulging of the pubic mound and the appearance of pubic hairs, while the labia majora and minora gradually become thickened and melanin deposits appear. Generally, the development of the female genital organs is completed by the age of 15, and the female genital organs are characterized by the adult type. There are individual differences in the development of female sexual organs, and they are also affected by various factors such as diet, environment and genetic background, etc. It is recommended to go to the hospital if there is any delay or advancement in the development of female genital organs, so as to avoid physical and mental impacts.