Effect of ciprofloxacin 250 bid, to a breastfeeding infant? Thanks in advance.

Rare complications. At regular doses Ciprofloxacin is considered relatively safe during breast feeding. Rare cases of a colitis in an infant & tooth staining have been recorded. The relative transfer in small (2-6%) and with short term treatment any effect can be minimized. See hall t, "medications and mothers milk" 15 ed.2012.