Maternal use of metronidazole can enter the infant’s body through breast milk, thus affecting the infant’s development. Metronidazole is metabolized by the liver, and the function of the infant’s liver is not yet perfect, increasing the burden on the infant’s liver; it can cause peripheral neuritis and convulsions; it can lead to changes in the blood picture, leukopenia, etc.; metronidazole and its metabolites are mainly excreted by the kidneys (accounting for 60%-80% of the total amount), and it can make the urine show a deep red color. The half-life of metronidazole is about 8 hours; maternal infusion of metronidazole should generally be discontinued after 72 hours before breastfeeding. Breastfeeding women must not just take drugs, if you are not feeling well and need to use drugs, must be used under the guidance of a professional doctor, so as not to cause adverse effects on the baby. Usually pay attention to diet and nutritional balance, do not favoritism picky eating, can improve the quality of milk, the baby growth and development is beneficial.