Yes, totally okay yan! Dami sa amin ang gumagawa nito, pump, ref, then warm it up sa warm water bago ipainom sa baby, wala namang problema. Just make sure you follow proper storage (most say 3-4 days sa ref is safe) at warm it gently lang, hindi mainit-init, para hindi ma-damage ang nutrients. Kung may doubts ka sa storage time or safety para sa baby mo specifically, quick check with your pedia would be good din!