To Janet Simpson: In the mom with mastitis and a urinary tract infection and whose infant was placed on pedialyte for the duration. First, Never place an infant on pedialyte for more than 24-48 hrs at most. Pedialyte is a rehydrating solution, and is by nature hypo-caloric, it is never used as a replacement for human or ABM milk formulations. Pedialyte only has about 100 calories per liter(3 cal/oz). In essence they're starving this child. Dicloxacillin, or a 1st or 2nd generation cephalosporin are quite good for mastitis, and would also probably be effective against the urinary tract infection, and seldom pose any problem for a breastfeeding infant. Another good choice would be trimethoprim-sulfamethoxazole, maybe for 2-4 weeks to prevent recurrence of UTI. The likelihood of kernicterus(due to sulfas) at this age is minimal. Although Cipro would be very good for this UTI, in a breastfeeding mom, it would not be optimal, nor probably even necessary. Again, Pedialyte is a rehydrating solution, never use it as a replacement for milk. *********************************** T.W. Hale, Ph.D. Associate Professor of Pediatrics Texas Tech University School of Medicine ***********************************