Girls begin to develop their body systems gradually at the age of seven or eight. Adolescent development is an important period from early childhood to adulthood, and breast development is the earliest in the appearance of secondary sex characteristics. Breasts begin to develop under the combined effect of ovarian hormones, pituitary hormones and insulin. The age of breast development varies greatly from one individual to another. At first, the nucleus of the breast forms and feels like a nodule or hard lump that is painful to press. Gradually, the areola and nipple begin to bulge, and the breast gradually becomes spherical. This occasional discovery of a lump in the child’s breast, first of all, do not give your daughter the burden of thought, usually pay attention not to bind, and do not gird the chest, avoid frequent touch and collision of breasts and nipples, while keeping the chest clean, eat less food high in sugar and fat, do not eat food ripened with ripening agents, and do not eat health products containing hormones. In general, eight-year-old girls with hard nodes in their breasts are mainly considered to be caused by the process of breast development, and the possibility of precocious puberty should be excluded. If the child has bilateral breast lumps, or simply hard lumps, accompanied by accelerated height and weight growth, rapid bone maturation, early epiphyseal healing, this situation is more likely to be considered precocious puberty, it is recommended that you should go to the pediatric endocrinology department for an interview, further examination is needed, according to the examination to do the corresponding treatment.