With the development of society, the pressure of raising children is increasing, many people are thinking that only one child is enough, but how can we ensure that this child can grow up healthy and strong? The key role played by eugenics is to prepare more before pregnancy than afterwards to remedy the effect is much better, that the mother needs to pay attention to what before pregnancy? 1, abstain from smoking, alcohol: research shows that alcohol for the fetus is a sure teratogen; smoking not only seriously affects the vitality of sperm, but also can make the uterus small blood vessel contraction, fertilized egg bed blocked. Both of them are harmful to the normal growth and development of the fetus. 2, away from pets, radiation, car exhaust, hair dye, perm, nail polish: toxoplasmosis infection can cause miscarriage or fetal malformation and intrauterine growth retardation, the computer, microwave ovens, induction cookers, photocopiers should be kept at an effective distance. The toxic chemicals in hair dyes and nail polish are harmful to the embryo. 3, balanced diet is not excessive, regular meals, correction of partial eating habits, adhere to a balanced mix, reasonable nutrition. 4. Maintaining ideal weight Overweight or underweight can affect conception. In addition, complications caused by pregnancy (such as diabetes and hypertension) are more common among overweight women. Conversely, underweight pregnant women are more likely to give birth to babies who are underweight and have congenital complications. 5, maintain a good state of mind confident and optimistic, happy and angry in moderation, quietly handle things, sincere treatment of others.