Smoking a small amount of cigarettes during breastfeeding will not be secreted from the breast milk, but smoking a large amount of cigarettes for a long period of time during breastfeeding will be secreted through the breast milk. You can’t smoke during breastfeeding. Cigarettes contain more harmful substances, such as nicotine, tar and carbon monoxide, which are secreted into the breast milk through the bloodstream, and the baby inhales cigarette toxins through the breast milk, which is detrimental to the baby’s normal growth and development. If you smoke a little bit during the breastfeeding period, it will not affect your baby through the breast milk, but if you smoke a lot of cigarettes during the breastfeeding period, it will affect your baby through the breast milk, which may cause respiratory disorders such as bronchitis, pneumonia and other respiratory disorders, and also have an impact on the development of the nervous system. To quit smoking and avoid second-hand smoke during breastfeeding is not conducive to postpartum body repair and may also affect the healthy development of the baby.