Liquid formulations of infant formula are made to be sterile and should not transmit Cronobacter infection when handled carefully. To prevent contamination of liquid formula:
Wash hands with soap and water before preparing bottles or feeding your baby.
Clean your baby’s feeding bottles in a dishwasher or by hand. In a dishwasher, use hot water and a heated drying cycle. By hand, scrub in hot, soapy water in a tub or basin reserved for washing bottles, then rinse well and air dry on a clean rack or dish towel. Consider using a bottle sterilizer or boiling the bottles after washing and rinsing them by hand.
If your baby does not finish drinking a bottle within 2 hours, throw away the unfinished formula.