The presence of breast nuclei in an 8 1/2 year old child may be abnormal. Breast development is a secondary sexual characteristic, and normal development in girls should begin to appear around the age of 9 to 12, so the presence of breast nuclei in an 8 1/2 year old child may be abnormal. When the breast nucleus appears in 8-year-old children, it is symmetrical on both sides, and the size of the nucleus is not big, which can be manifested as a symptom of mild pain when it is pressed, and it is considered that it may be precocious puberty. Precocious puberty is a kind of endocrine disease of abnormal growth and development of children, tumors, trauma, hydrocephalus and so on may induce precocious puberty, there are also a few children, because of eating too much high-calorie food, resulting in the emergence of pseudo-milk nuclei. If your 8.5 year old child develops breast nucleus, it is recommended that you go to the hospital in time to find out the cause of breast nucleus, and diagnose the disease through observation of signs, pelvic ultrasonography, CT, and gonadotropin-releasing hormone stimulation, bone age determination test and other related tests, and take the right treatment. Usually, you can educate your child about physiological knowledge and provide appropriate psychological counseling to avoid worry and panic; avoid eating junk food, eat a normal diet, and eat more fresh vegetables and fruits.