Can I save baby cereal for later?
Never allow opened jars of food to sit at room temperature for more than two hours. Solid baby foods that have been opened may be stored in the refrigerator for a maximum of three days.
We don’t recommend using the formula after the 30 days of opening because the nutrients start to degrade. Open ready-to-feed or concentrate formula (prepared or unprepared) can be refrigerated for 48 hours.
Beside this, Does baby cereal really expire?