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Substances such as nicotine and carbon monoxide in tobacco can constrict blood vessels and reduce blood oxygen content, causing placental blood perfusion to decrease, resulting in intrauterine growth restriction and low birth weight. The amount of smoking is directly related to the weight of the newborn. Someone has made a comparison. Compared with women who smoke a lot and women who do not smoke, the number of low-birth-weight babies (less than grams) is doubled, and the number of babies with small gestational age (compared with children of the same gestational age) Ratio, percentage point below average weight) increased by . The chance of infertility and spontaneous abortion. Due to the reduced blood supply to the uterus, placenta previa, placental abruption, premature birth and intrauterine hypoxia may occur. Smoking during pregnancy is also a major risk factor for sudden infant death: smoking during lactation, Toxic substances can pass through breast milk to the baby and still have toxic effects. If a woman stops smoking during early pregnancy, just like non-smoking women, she can deliver a child of normal weight. It is also necessary to stop smoking during breastfeeding.