Use prepared infant formula within 1 hour of starting the feeding and within 2 hours of preparation if left at room temperature.
If you will not use the prepared infant formula within 2 hours, store the bottle in the refrigerator immediately and use it within 24 hours.
Throw out any infant formula that’s left in the bottle after feeding your baby.
Do not refrigerate it to save for later. The combination of infant formula and your baby’s saliva can cause bacteria to grow.