Monobactamic antibiotic which is similar to penicillins. It is excreted into breast milk in insignificant amount. Not absorbed by the intestine. No adversed effects on breastfed babies have been reported. It is commonly prescribed to children and newborns. Be aware of false negative bacterial cultures in the infant when the mother is on antibiotics. American Academy of Pediatrics: Maternal Medication Usually Compatible With Breastfeeding