(1) Conceive when you are in the best physical and mental condition, not during the newlywed period or while traveling. (2) Conceive in the right season, not during thunderstorms, harsh winters, or high summers. (3) Conceive at the right age, not more than 35 years old as far as possible for both men and women. (4) To avoid the influence of adverse factors, do not contact with radiation, pesticides and other toxic substances. (5) To maintain a good state of mind and pleasant mood, do not be temperamental and depressed. (6) To maintain reasonable and balanced nutrition, do not favoritism. (7) To quit smoking and alcohol, do not I do. (8) To exercise appropriately, enhance physical fitness, do not be too comfortable, to avoid infection by viruses and other pathogenic bacteria. (9) Pay special attention to the use of medication during pregnancy and do not use medication indiscriminately or without medication when you are sick. (10) Reasonable examinations before and after pregnancy should be carried out, and not too many examinations or no examinations.