Once opened, Formula (prepared) keeps about 1 day in the fridge.
| Situation | Keeps for |
|---|---|
| Opened · pantry | 1 hour |
| Opened · fridge | 1 day |
About 1 day refrigerated at 40°F (4°C) or below, according to USDA FoodKeeper v128.
Formula (prepared) is shelf-stable at room temperature: cool, dry pantry, sealed — refrigerating after opening is optional and mainly preserves quality. Refrigerating it mainly preserves quality rather than safety.
Look for: A lid that doesn't pop when you first open it; Off smell or a colour change; Mould, or contents that have separated; Any leaking, bulging, or rusted container. Never taste something to test it — when in doubt, throw it out.