Federal health officials are warning parents of newborns to sterilize equipment used for both bottle- and breast-feeding after a baby died last year from a rare infection tied to a contaminated breast pump. Samples from expressed milk, a breast pump used in the hospital and the liquid human milk fortifier were all negative for the bacteria. In its report issued Thursday, the CDC said "caregivers of infants should follow safe hygiene, preparation, and storage practices, and learn steps to protect infants from infection