Evaluation and treatment of mastitis in infants.

We reviewed cases of mastitis in infants treated at Children's Healthcare of Atlanta from 2005 to 2011. Among infants with breast cultures, Staphylococcus aureus was the most common cause. No infant with a positive breast culture had a concordant positive culture elsewhere. Our findings argue that urine, blood and spinal fluid cultures are unnecessary in well-appearing afebrile infants with mastitis.