Couples want their children to be physically fit and intellectually developed. What is the most important thing to do in order to have a good birth? We do a good job from 3 stages, namely before marriage, after marriage to the pre-conception stage, and three stages of pregnancy. In this period to do a good job of reproductive health care, a strong guarantee of a healthy and harmonious marriage and family life, pregnant with a smart and healthy baby. Premarital stage: proper knowledge of sexual health, knowledge of fertility and environmental eugenics, and should prevent inbreeding. At this stage, premarital sex is very common, many young men and women living together before marriage is a common phenomenon, premature sex, not only the lack of knowledge of sexual health, while the development of reproductive organs is not very mature, very easy to occur vaginitis, cervicitis, pelvic inflammatory disease, and accidental conception after the abortion and abortion to terminate the pregnancy. In the obstetrics and gynecology clinics, about 1/3 or more of the unmarried people have abortions due to unwanted pregnancy. Most young men and women lack the knowledge of female hygiene and contraceptive knowledge, and there are few people who use emergency contraceptive pills afterwards, and some even use emergency contraceptive pills several times, which seriously disrupts the normal reproductive endocrine function of women and causes disorders of the reproductive endocrine axis and related diseases. This has laid a hidden danger for normal fertility in the future. Many infertility patients have difficulty in conceiving after one abortion or medical abortion, and embark on a long road of infertility consultation, regretting that they are too young to pay for their youthful ignorance. Foreign survey results show that having sex before the age of 18 is 13 times more likely than having sex above the age of 25 to have cervicitis, and the prevalence of cervical cancer in women married at the age of 20 is 7 times greater than in women married at the age of 26. In order to live happily in the future marriage and family, young men and women should be cautious in cohabitation before marriage, enhance knowledge and awareness of sexual health care, take normal contraceptive measures (condoms), avoid menstrual intercourse, avoid unclean intercourse, avoid multiple sexual partners, avoid causing inflammatory diseases of the reproductive tract, leading to secondary infertility. After marriage to the pre-conception stage: choose the right age to marry and give birth, both men and women in the psycho-physical and material basis have a certain guarantee, the marriage has a certain guarantee is also happier. So, what is the appropriate age of marriage and childbirth for young men and women? Usually, the age of marriage should be 23 years old for women, 25 years old for men is appropriate. And the age of childbirth, women are 25 to 29 years old, men are 26 to 35 years old. Couples who have not planned to conceive after marriage should do well in contraception, with condoms as the first choice, and women should not use intrauterine devices for contraception before having children. After 1 to 2 years of happy ‘two-person world’ ready to plan conception, should be well prepared for pre-conception eugenics. First of all, avoid high age pregnancy, reasonable nutrition, control weight gain. Secondly, the couple should avoid bad habits such as smoking, alcohol, staying up late and irregular life, eat and live regularly, keep the harmony and happiness of the small family, and keep the emotional, physical and intellectual rhythm of the couple in good condition. Avoid contact with cats, dogs and other small animals, which are prone to parasitic Toxoplasma gondii, and close contact with animals can easily infect humans, i.e., suffer from toxoplasmosis, especially when pregnant women are infected, which can be transmitted to the fetus through the placenta, causing miscarriage, premature birth, stillbirth and fetal malformation. Take daily folic acid tablets 3 months before conception, and project the ovulation period according to the woman’s menstrual cycle (usually women with regular menstrual cycle ovulate 14 days before menstruation), and have intercourse 1 to 2 days before and on the day of ovulation to have the best chance of conception. Perform some routine medical examinations before pregnancy, including blood and urine routine, blood type, liver and kidney function, fasting blood sugar, hepatitis B, syphilis and HIV screening, cervical cancer screening, etc. Pregnancy stage: Continue to take daily folic acid supplements during early pregnancy. Early pregnancy reactions usually start from the 6th week of pregnancy and gradually disappear after the 12th week. Avoid tension and anxiety, pay attention to rest and ensure enough sleep. You can eat according to your preference, in small amounts but with variety, eat whatever you want, and eat whatever you like without considering the nutritional value of food for the time being. Be more hydrated, do not wait until you are thirsty to replenish water, and avoid too greasy food. Establish a prenatal health card at the obstetrics clinic of the hospital from 11 to 13 weeks of pregnancy, have regular prenatal checkups according to the doctor’s instructions, follow the doctor’s guidance, have reasonable nutrition during different pregnancies, and supplement with multivitamins and calcium, iron, zinc, etc. It is recommended to eat some nut foods such as walnuts and melon seeds every day to make your child smarter. Avoid sex during early pregnancy (first 3 months) and late pregnancy (second 3 months), avoid pets throughout preconception, close contact with small animals, keep a relaxed and happy mood, husbands should care for their wives, give the little baby to be born a warm and beautiful family environment, do this, I believe you will have a healthy and lovely baby!