Couples can only conceive a child if they have the following conditions, such as normal sperm for the man, normal eggs for the woman, clear fallopian tubes, normal uterine cavity, and normal sex life for the couple. 1. Normal sex life: pregnancy requires regular sex life of both husband and wife, especially during ovulation, it is recommended to have intercourse 1 day apart to increase the chance of conception. 2. Male sperm: normal sperm is one of the guarantees for pregnancy. 3. Female eggs: the woman has normal menstrual cycle, mature eggs, development of dominant follicles and regular ovulation. 4. Smooth fallopian tubes: the fallopian tubes are the channels through which sperm and eggs meet, a necessary condition for natural fertilization, which requires smooth fallopian tubes. 5. Normal uterine cavity: The uterine cavity is normal in shape, including normal endometrium. During the preparation for pregnancy, couples are advised to prepare for pregnancy scientifically under the guidance of professional doctors to carry a healthy baby.