The female breast starts to stop developing at about 16-18 years old, 16-18 years old is the time when the development of secondary sexual characteristics of women ends, most women start to enter the development of secondary sexual characteristics at the age of 10-13 years old, the breast begins to increase in size, which can be maintained for 3-5 years and ends at about 18 years old, a small number of people can be maintained until 20 years old, after the end of puberty development, any drugs or physical therapy methods are not able to make After puberty is over, no medication or physical therapy can make the mammary glands develop. During the development of adolescence, try to pay attention to a reasonable nutritional diet, the right amount of protein every day, a good habit of life and rest, do not stay up late, can promote the growth and development of the body, female breast development is still mainly affected by genetic factors, try to maintain a positive and optimistic attitude, keep a happy mood, usually pay more attention to exercise, exercise, to ensure adequate sleep.