Girls begin to be fertile at around 13 years of age, and reproductive function matures at around 22 years of age. Typically girls begin puberty at around 13 years of age, and during puberty girls will begin to develop in all aspects of their bodies and ovarian function. Some girls will begin to ovulate at this time. Ovulation is followed by menstruation, which also represents fertility at this time. Although girls begin to ovulate around the age of 13, the quality of the eggs is still relatively low due to the immaturity of the girl’s development. If a pregnancy is conceived at this time, it may result in fetal malformations, preterm labor, and miscarriage, and preterm labor can have a serious impact on a woman’s health. Therefore, when a girl is about 22 years old, she is relatively mature in her physical and mental development and is therefore suitable for childbirth. The youngest age at which a woman can give birth is around 22 years old, when her reproductive function has developed and reached the standard at which she can become pregnant.