To determine whether breasts are developing or not, you can observe the appearance of the breasts and touch them, etc. Since everyone has different genes, body type and other factors, the symptoms of development are also different and cannot be generalized. 1. Appearance of breasts: When breasts develop, the appearance mainly shows that the nipple gradually becomes thicker and bigger, while the pigmentation area around the nipple and areola gradually expands, and the mammary gland tissue also begins to grow, so that the breasts protrude upwards and have a hemispherical appearance, i.e., the breasts appear to be developing. 2. Touch: Due to the change of hormone level in the body, the areola is raised upward, and a hard knot can be touched underneath the areola at the same time. Part of the population may be accompanied by localized breast pain, swelling and other symptoms, which are generally normal physiological phenomena. If the breast development is abnormal and the appearance is not clear to touch, it is recommended to go to the hospital in time to clarify the cause of the disease and adjust the hormone level in the body. It is also recommended that when breasts are growing and developing, they should consume high nutritious food, such as eggs, milk, fruits, lean meat and so on. Try to wear comfortable, appropriate size underwear, avoid staying up late, appropriate sports, enhance the body’s immunity.