Both cephalexin (Sporidex) and amoxicillin/clavulanate (Augmentin) are generally considered safe to use while breastfeeding. Only tiny amounts enter breast milk, and they are among the safest, most common options available for treating gum infections. Occasionally, a baby might experience mild, temporary changes like loose stools or a diaper rash, but these are easily managed. You can safely take either prescribed medication. Unless you have allergies, there is no need for alternative drugs.