How long does infant formula last?

Infant formula must not be used after the use-by date printed on the container; opened powder should usually be used within 1 month.

	Infant Formula
Unopened	Until the use-by date on the container (required by US law); do not use it after
Opened	Powder: usually within 1 month (follow the label). Prepared bottles: within 2 hours, or 24 hours refrigerated
Ideal storage	Cool, dry place, not in a hot car or garage.

Storage tips

Rotate formula early: buy new cans well before the oldest reach their dates.
Ready-to-feed formula needs no water, which matters during a boil-water advisory.
Always use safe water for mixing; during an emergency follow local boil-water guidance.

Signs it has gone bad

A rancid smell, often described as crayons, putty or old paint (oils, nuts, nut butters, whole-milk powder)
Mold on the surface or under the lid
Off colors or a sour smell
Hard clumps in sugar or salt are only moisture and are harmless; break them up

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