The main things to avoid during breastfeeding are wine and food containing alcohol, spoiled food, and medicines that affect the breast. 1. Alcohol and food containing alcohol, such as red wine, beer, rice wine, and candies. Alcohol is a small molecule that can easily enter the baby’s body through the mother’s blood and breast milk, causing adverse effects on the liver and nervous system. 2. Spoiled food, such as moldy nuts, expired dairy products, rotten fruits and so on. These foods may be contaminated by molds and other pathogenic microorganisms, and when consumed by lactating women, they not only affect their own health, but also the quality of breast milk, which can have adverse effects on the body of the breastfeeding child. 3. Drugs that affect the breast, such as tetracycline, gentamycin, etc., which have adverse effects on the teeth of the breast; estrogen-containing drugs, such as ethinylestradiol cyproterone, combined with estrogen tablets, etc., which inhibit the secretion of breast milk; and drugs containing aminopyralid such as anacin, which have an adverse effect on the blood system of the breastfeeding mother and the breast. 4. Others, such as squarehead fish, marlin, puffer fish, etc. These foods contain mercury and other toxins, which can easily cause food poisoning. Diet during breastfeeding should be diversified, light in taste and digestible, high sugar, high fat and spicy food can be eaten appropriately, but the intake should be controlled.