To warm bottle or not ??

Okay so some people don’t warm bottle which I find crazy I’ve grown up and everyone around me has warmed their babies bottles well they make a bottle by having hot water from a kettle and then you put the bottle in a jug of cold water to cool until right temperature and aparanetly you can give your babies cold bottle ?? Well room temp! I don’t know think ill be doing this everyone I know who is now doing it they have sicky babies and always throwing up after feeds and that doesn’t seem right to me ... what are u going to feed your baby warm or cold? Please don’t comment neither because breast is best 😂🙄