Both ampicillin and sulbactam are excreted in breast milk in insignificant amounts (Campbell AC 1991, Matheson I 1988, Nau H 1987, Foulds G 1985, Matsuda S 1985) and no side effects have been observed in infants whose mothers were taking it ( AAP 2001). Follow-up for appearance of diarrhea since alteration of intestinal flora can occur (Chin KG 2000). The possible negativity of cultures in febrile infants whose mothers take antibiotics should be taken into account, as well as the possibility of gastroenteritis due to altered intestinal flora (Benyamini 2005, Ito 1993, Kafetzis 1981).