Generally, cefaclor can be taken during breastfeeding and can be used to treat infectious diseases. Cefaclor belongs to the second generation of cephalosporin antibiotics, which is a kind of broad-spectrum antibiotics and is mainly used for infectious diseases caused by various bacteria, such as pharyngitis, tonsillitis and other upper respiratory tract infections, bronchitis and other lower respiratory tract infections, ureteritis, urethritis and other urinary tract infections. However, if a breastfeeding woman wants to take Cefaclor, she needs to consult a physician and should not self-administer the drug. In addition, care should be taken to suspend breast-feeding during the period of medication because cefaclor can be excreted in small amounts through breast milk. If the infant drinks the milk produced by the mother after taking the medication, the drug may also be absorbed into the body, resulting in adverse reactions such as diarrhea and nausea. If breastfeeding is needed, it is best for the mother to stop taking the drug and make sure it is completely excreted before continuing breastfeeding to avoid adverse effects on the baby’s health. In addition, cefaclor belongs to the antibiotic class of drugs, and some people have allergic reactions. Patients should conduct a drug sensitivity test before using the drug to determine whether they are allergic to the drug, and if it is clear that they are not, they can take the drug. It should also be noted that breastfeeding is a special period, and most women need to breastfeed, and more drugs can be metabolized by breast milk, so mothers need to consult their physicians before taking other drugs besides cefaclor.