Ay, nakakabahala talaga yan! Based sa safety guidelines, once mixed, Pediasure should be consumed within 1-2 hours at room temperature, pero since nasa ref mo siya, pwede nang hanggang 24 hours, pero honestly, I'd use it within 8-12 hours lang to be safe, lalo na if ang baby mo hindi agad nakainom. Kung 7pm tinimpla mo at di pa rin sinalihan ng baby, better kung i-discard mo na lang after a few hours para sure na walang bacteria growth, especially sa mainit na weather natin dito. Para sa peace of mind, kung may doubt ka pa rin, better mag-check with your pedia, mas okay na maging cautious sa feeding ng babies, diba!