Eight-week-old girls with hard lumps in one breast generally need to consider two cases, one case is prepubertal breast hyperplasia, the other case is pubertal breast development, as follows: 1. Prepubertal breast hyperplasia: generally manifested as bilateral breast asymmetry, limited hyperplasia, often showing limited hyperplasia in one side of the breast, with a small hard node, small hard lumps, the child most of them do not have obvious discomfort. In this case, there is generally no need for special treatment, so that the child can relax, eat a light diet, and try to avoid the intake of foods that may contain hormone-like substances, such as fried foods, meat foods, fast foods, etc. Usually, after a period of observation, it will gradually shrink and disappear. 2. Adolescent breast development: In the case of breast development, it is usually a bilateral breast symmetrical and Evenly proportioned hyperplasia, this situation mentioned in the question, pubertal breast development is not very likely.