Hello, Sophie and welcome back to Just Answer.According to the manufacturer, it's best to prepare each bottle at the time of feeding; however, if you would like to prepare a bottle in advance and refrigerate it, you can do so and then place the bottle in a bowl of warm water or room temperature water, to bring it up to room temperature before feeding. Always test the temperature of the formula from the bottle on your wrist. Here are written instructions and a video from the manufacturer about the best way to prepare the formula:https://www.s-26.com.au/resources-for-mums/bottle-feeding/how-to-prepare-a-bottlehttps://www.s-26.com.au/resources-for-mums/demonstration-videos/how-to-prepare-a-bottle____________________________________________
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