Coffee consumed once during breastfeeding can usually be excreted in 6-8 hours, the exact time needs to be judged according to the amount of coffee consumed, the type of coffee, and one’s own metabolism ability and other factors. Usually, it is recommended to drink less coffee during breastfeeding because coffee contains caffeine, which has the effect of excitation of the central nervous system. It can enter the baby’s body through breast milk and stimulate the central nervous system and the contraction of the heart muscle, resulting in headache, dizziness, irritability, insomnia, accelerated heartbeat, shortness of breath and other symptoms, which will affect the baby’s physical health. If you need to drink coffee, it is recommended to drink a small amount of it, and you can usually breastfeed after 6-8 hours; if you drink a large amount of it, it is recommended to breastfeed again when you are 24 hours old. In addition, breastfeeding women are advised to eat more foods rich in protein and vitamins, drink more water and keep the bowels clear. Normally, they should avoid exertion, increase rest time appropriately, ensure sufficient sleep, and exercise appropriately.