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Toss any unused dry formula after 1 month of being opened. Discard ready-to-feed liquid 24 hours after being opened. Discard any unfinished formula after one hour.

Article:
Do not feed your baby a formula bottle that has been unfinished after one hour. Your baby’s saliva can lead to contamination. Refrigerating or reheating the formula will not destroy any bacteria that may be growing.