Quadrivalent refers to the quadrivalent HPV vaccine, and to have children mostly refers to pregnancy. It is recommended that you can get pregnant six months after the quadrivalent HPV vaccine. Quadrivalent HPV vaccine is mainly used to prevent cervical cancer, anal cancer, vaginal cancer, vulvar cancer, condyloma acuminatum and other diseases in women aged 9-45 years old, and after the injection, it can generate HPV antibodies in the body, so as to achieve the purpose of preventing related diseases. The vaccine has been shown in clinical trials to avoid special periods of time, such as pregnancy, breastfeeding, and infections. Therefore, in order to be safe during the period, it is generally recommended to get pregnant six months after the full vaccination. However, for those who have been vaccinated for less than half a year, or those who become pregnant unintentionally during the course of vaccination, there is no need to terminate the pregnancy, mostly because there is no clinical evidence to prove that the vaccine will have an adverse effect on the fetus. For those who have unwanted pregnancies and want to have children, it is recommended that they undergo regular obstetric checkups in order to ensure eugenics.