Typically, little girls begin to develop between the ages of 8 and 12. Pubertal sexual development in girls begins with breast development and ends with the onset of menstruation, which marks maturity. It is normal for breast development to begin between the ages of 8 and 12. The age at which a girl develops varies, with the average age for girls being around 10 years old. After the age of 10, breasts will gradually develop and body hair will appear. If a girl develops earlier than 8 years old, it may be precocious puberty, most likely related to the child’s daily diet, work and rest, and other aspects, if parents are not assured, you can take the child to the hospital for examination. If a girl develops later, it is mainly caused by the lack of nutrients in the body, which needs to be supplemented to ensure the normal development of the body. It is recommended that parents usually let the child to develop a regular diet and work and rest habits, do a good job of comprehensive care, eat more fresh fruits and vegetables, less snacks, to ensure balanced nutrition, conducive to the development of puberty. Try to eat less food containing hormones after processing.