[. . . ] Wash and rinse thoroughly then sterilise using a Philips AVENT steriliser or boil for 5 minutes. [. . . ] Wash and rinse thoroughly then sterilise using a Philips AVENT steriliser or boil for 5 minutes. â· DO NOT warm contents in a microwave oven as this may cause uneven heating and could scald your baby. â· Wash your hands thoroughly and ensure surfaces are clean before contact with sterilised components. DO NOT use cups with spouts to mix infant formula as this may clog the non-spill valve and cause components to leak. Magic Cups should only be used as an aid to help children progress to using ordinary cups. â· Keep all components not in use out of the reach of children. [. . . ] Magic Cups should only be used as an aid to help children progress to using ordinary cups. [. . . ]