Once the baby has drunk from the bottle, can I refrigerate the formula for later use?
We don’t recommend that formula be fed again once a baby has nursed from the bottle. During a feeding, the baby’s saliva can come in contact with the formula in the bottle. The enriched nutrients found in infant formula can create an excellent breeding ground for microorganisms to grow. Unfortunately, neither refrigeration nor reheating will prevent this growth, so we recommend that any unused formula be discarded within 1 hour from the time baby’s mouth first came into contact with the nipple.