Okay, so mainit talaga dito sa Pilipinas, kaya gets ko why you'd want to give it cold! Pero better to let vitamins stay room temperature lang, babe, ang malamig from the ref might upset their little tummy or make them uncomfortable, lalo na sa ganitong edad. A few of us moms just keep the vitamins sa drawer or cupboard at room temp, then mix with formula or breastmilk kung kailangan, way safer and mas comfortable para sa baby. Pero para sigurado, best to check with your pedia kung paano talaga sila gusto i-give, basta room temp usually ang safest bet!