Breastfeeding women are generally not allowed to smoke, usually because smoking during breastfeeding will affect the secretion and quality of breast milk, and will also have a certain impact on the growth and development of the baby. Cigarettes contain nicotine, tar, carbon monoxide and other harmful substances, which, when inhaled by a lactating woman, will affect the production of prolactin and lactogen to a certain extent. Milk is usually produced through the milk ducts under the joint action of prolactin and lactogen, and smoking will lead to a decrease in the production of milk, and the quality of milk will be affected to a certain extent, which in turn will affect the growth and development of the baby. Women should avoid taking medication while breastfeeding. If medication is really needed, follow the doctor’s instructions and stop breastfeeding while taking the medication if necessary. It is not recommended to drink alcohol, coffee or tea during breastfeeding. During breastfeeding, women should have a proper diet, balanced nutrition, regular work and rest, and appropriate exercise.