Taking birth control pills will not affect the intelligence of the fetus. The main ingredients of birth control pills are estrogen, progesterone and mifepristone. Estrogen and progesterone itself also have the effect of preserving the fetus, if a woman is in the early stages of pregnancy, detecting low levels of progesterone and estrogen and experiencing preeclampsia, she can use estrogen and progesterone to preserve the fetus, and these two drugs will not lead to fetal deformities. Mifepristone is a progesterone antagonist, after the use of easy to cause the embryo to stop the development of the situation, if it does not cause the embryo to stop the development of the patient in the case of stopping the use of the patient can also continue to continue the pregnancy, there is no great effect on the embryo. Patients taking contraceptive pills if the contraceptive failure, intrauterine normal pregnancy, the patient can continue the pregnancy, pregnancy after regular obstetric examination, can be done through the Down’s syndrome screening, non-invasive genetic testing or amniocentesis, to rule out the fetus has mental retardation.