Yeah I have a microwave but doesnt it loose its nutrience when heated up like that?? Have a pirex jug and usally pour hotwater over the bottle in the jug and let it sit there. I know the one this afternoon was semi cold cause he was hungry and tried breastfeeding for 30 mins and was still unsettled and hungry and I just wanted some peace and gave it to him. He seems fine (well at the moment anyways)