There is no evidence that childbearing affects the prognosis of breast cancer patients, but the risk of recurrence and metastasis of the disease and the impact of treatment on the offspring must be fully considered when choosing whether and when to have children. Currently, there is a strong preference, both nationally and internationally, that: 1. Patients with carcinoma in situ of the breast, i.e., without local invasion or distant metastases, may be considered for childbearing after completion of surgery and radiation therapy. 2. Patients with lymph node negative invasive carcinoma of breast can consider having children 2-3 years after surgery because the time before that is the peak time of recurrence and metastasis after surgery. 3.Patients with lymph node-positive invasive carcinoma of breast can consider having children 5 years after surgery. 4.Patients who need adjuvant endocrine therapy need to stop endocrine therapy three months before conception, until the end of stopping breastfeeding after childbirth, and then continue endocrine therapy.