Switching to cow's milk

[NickyEds]

I'm not sure if this is the right place to post but...DS is a week off being one and I want to switch to cows milk. Do you still need to sterilise the bottles? At the moment he still has a feed in the night (I know, I know) and up until now we've been using a carton. It would be nice to save on the expense of these and my sister said to just take a bottle of cows milk up to bed and use it whenever needed in the night. He usually has the feed at 2/3ish, I would probably drink milk that's been out for 4/5 hours but is it ok for a baby?

I don't think you have to sterilise things at this age (I have no actual idea though as I wasn't using bottles), I didn't sterilise cups, plates or whatever.

I wouldn't use cows milk that has been sat out for 4 or 5 hours myself. Is it a huge hassle to go downstairs and get it? Could you put it upstairs in a cool bag with ice packs?

Not a huge hassle but a couple of flights of stairs-it's more that some other mums have mentioned doing it so I thought I might be missing a trick.

I don't sterilise for formula after a few months anyway. You can't let them have a bottle of anything in bed though because it's awful for their teeth.