You don't need to sterilise bottles/cups with cows milk. I found as with most bottles though it does smell after a while even though clean so I do sterilise once a week but that could also be my pregnancy nose😂 you can leave milk out for up to 4 hours out of the fridge but you can always pop it back in the fridge whenever they've finished x
You don’t have to sterilise after cows milk. The issue previously is that formula isn’t sterile and can breed bacteria so you have to sterilise the bottles.
You don’t need to sterilize. And I wouldn’t do longer than a couple hours because it’ll just start to smell and what not. So I try to not use after 2 ish hours. But at this age they will most likely finish at this time. And if it’s for like breakfast then put it back in the fridge and they can finish it whenever. But out of the fridge like in their beds then I wouldn’t do past a couple hours