Avoid smoking and drinking alcohol during breastfeeding, and prevent the mother and baby from inhaling second-hand smoke. Breastfeeding mothers should avoid drinking strong tea and large amounts of coffee to avoid excessive caffeine intake. 1. Nicotine in tobacco can enter the breast milk and can first reduce milk production by inhibiting oxytocin and prolactin. 2. Although the mammary glands do not store alcohol, the amount of alcohol in breast milk is positively correlated with the mother’s blood alcohol level. Studies have shown that a mother’s lactation can be reduced by about 20% 3-4 hours after drinking alcohol. In addition to decreasing lactation, alcohol consumption can change the odor of breast milk, which in turn reduces the infant’s uptake of breast milk. Alcohol consumption by mothers has an effect on infant sleep. It has been reported abroad that infant sleep time is significantly reduced 3.5 hours after maternal alcohol consumption. It was shown in a prospective cohort study. Maternal alcohol consumption can have an adverse effect on infant gross motor development. 3. Strong tea and coffee contain more caffeine. Studies have shown that the intake of caffeine by breastfeeding mothers can cause infant irritability and affect the quality of infant sleep, and long-term intake of caffeine can affect infant psychiatric development, so mothers should avoid smoking and drinking during breastfeeding, and avoid drinking strong tea and coffee. During the breastfeeding period, try to eat light, nutritious food, you can drink more nutritious soup, such as pork chop soup, fish soup, etc., to provide enough nutrition for the development of the baby.