Merylin: Although there are no data about this quinolone antibiotic (I think it's called Trovan, generic trovofloxacin), I would wonder whether her E.Coli infection is resistant to all other antibiotics which could be used. Did this mother ask the doctor what other antibiotics the bug is sensitive to? It's just possible that unless this doctor is very bf supportive, he/she didn't really think about the bf issue, just wanted to use the latest drug. Good luck, Alicia Dermer, MD, IBCLC.