I usually keep mine for about five days in the refrigerator. Gerber makes the smaller 2.5 oz jars of the tender harvest organic fruit. I usually smell it on the fifth day to make sure it doesn't smell bad. They usually eat it and there haven't been any problems. I think if it's gone bad, they will know and wont eat it.
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Lisa

1.0.0 P.m. grandis (Linus)
4.3.0 P. standingi (Toby & Kona and their 5 babies)