Children from birth to 7, 8 years old or so under the nipple may appear hard lumps, the newborn child is considered to be the mother’s estrogen level is too high, along with the high level of estrogen in the body of young children, causing the formation of stress lumps under the nipple, if there is no infection, there is no bigger situation, can be disregarded, with the child slowly grows up, the body hormone levels return to normal, the lumps will gradually disappear. Girls at the age of 7, 8 or so due to daily dietary habits, there may be a transient high levels of estrogen in the body, which can cause hard lumps under the nipple, there will be painful symptoms, you can guide the child to pay attention to the diet, eat more vegetables, fruits, strengthen the sports, and develop a good habit of life. When the lump pain is more obvious, you can use hot compresses and so on, remember not to squeeze, do not use external intervention, so as not to cause damage to the gland, the development of the gland in the future will have a certain impact.