When a couple forms a family, preparation for pregnancy is bound to be faced together. Now that preconception preparation is getting more and more attention, couples who are ready to have a baby are trying to do a good job of preparing for pregnancy. The following are five common problems in the process of preparing for pregnancy, which can be studied by the unexpectant parents. 1.Why should we prepare for pregnancy In China, the birth defect rate is on the rise year by year, with as many as 800,000 to 1.2 million children born with birth defects each year. The birth defect monitoring results show that the country has a total of nearly 30 million families have given birth to defective children, accounting for nearly 1/10 of the total number of families in the country. prevention of birth defects is particularly effective and economically safe way is: before pregnancy to take the necessary nutrition, quit smoking and alcohol, to avoid exposure to radioactive and harmful substances and other health care measures; followed by prenatal screening during pregnancy, early detection, early diagnosis. 2. How long is the best time to prepare for pregnancy? Preferably one year, at least one month. It takes three months to repair damage factors other than genes. Pre-conception health promotion should be for both men and women. Eggs mature one per month, however, they are characterized at 4 months of embryonic life and gradually age over time. Sperm are newly matured every day and a sperm needs to grow for 76 days to mature. 3.How to prepare for pregnancy? First of all, stop smoking and drinking, live a regular life, eat reasonably; strengthen exercise, do not stay up late, do not have pets, and live in an environment free of harmful factors (formaldehyde, benzene, car exhaust, noise, radiation from cell phones and home appliances, high humidity and high heat, drugs). Next, do a comprehensive physical examination, including gynecological examination, blood routine, urine routine, trace elements, liver function, blood pressure, etc., especially for sexually transmitted diseases and virus testing. Vaccination for hepatitis B, rubella and chickenpox before pregnancy. Sperm quality examination of the male partner is very important. Once again, if there is a problem, treat it promptly, take medication under the guidance of the doctor, and supplement vitamins such as folic acid. 4.What foods and drugs are minefields? Do not take supplements at will, and use less or no plastic products. Women’s medication can be viewed in the drug instructions, but there is little guidance for men’s medication. Male medication note: sedatives, sleeping pills, anti-cancer drugs, immunomodulators, hormonal drugs, sexual health products and other drugs can damage male gonadal function; there are morphine, chlorpromazine, erythromycin, rifampin, antipyretic painkillers, ciprofloxacin (artificial antibacterial), ketoconazole (anti-mycotic) can cause male sperm damage. 5, special concerns for women Dental examination: whether suffering from dental caries, gingivitis, calculus, unpreserved tooth stumps, repeated inflammation of blocked teeth, bad restorations and other oral problems, do not use nail polish, hairdressing, whitening and anti-wrinkle products (containing heavy metals); do not drink milk tea and other sweetened drinks, etc.