In order to have a healthy and smart baby, young parents should know a certain amount of knowledge about pre-pregnancy preparation, pregnancy and childbirth health care, and nursing a newborn. Today, I will organize some of the most common “digital questions” that people ask. It is recommended that every expectant father and mother memorize these special numbers! 1. The best age for women to have children is 24 to 29 years old. 2. The best age for men to have children is 25~36 years old. 3.Higher maternal age, more than 35 years old. 4.The time when the early pregnancy reaction appears, usually starts about 40 days (6 weeks) after conception. 5.The time of the first examination: when menstruation is delayed for about one week or when the early pregnancy reaction is determined or identified. 6, the fetus grows in the mother’s body time, 40 weeks that is 280 days. 7, the expected date of birth calculation method, the first day of the last menstrual period in the month plus 9 or minus 3, the date plus 7. 8, spontaneous abortion is prone to occur within 3 months after pregnancy. 9, prenatal checkup time is generally 5 to 6 weeks pregnant, the start of prenatal checkups; 7 months before the general once a month; 8 months after every half a month; the last month once a week; there are special circumstances should be examined, or follow the doctor’s advice. 10, the number of prenatal checkups, generally recommended 12 times, if there are no abnormalities, even in the case of limited conditions, should receive at least 7 prenatal checkups. 11.Daily folic acid supplementation of 400~800μg in early pregnancy. 12.Normal blood pressure value is less than 140/90mmHg. 13.Down’s screening time 14~20 weeks. 14, Diabetes screening time 24~28 weeks. 15, pregnant mother’s hemoglobin is not less than 110g / L 16, pregnancy with uterine fibroids incidence of about 2% ~ 10%. 17, suitable for pregnant women bathing water temperature of about 38C. 18, suitable for pregnant women to sleep temperature 20 ~ 24 ° C. 19, pregnancy, late weekly weight gain normal range of 0.36 ~ 0.45kg. 20, the total value of weight gain during pregnancy 12kg. 21, consciously appeared fetal movement time 16 ~ 20 weeks of pregnancy. 22, the most active time of fetal movement is 28-34 weeks of pregnancy. The normal number of fetal movements is 30-40 per 12 hours. 24, the normal number of fetal heart sounds 110-160 times per minute. 25, Overdue pregnancy exceeds the expected date of delivery by 14 days (two weeks).