Has anyone used formula after the two hour rule.... My son is 12 Weeks and on formula. We give him a bottle at 9.30/10.30 pm made up from powder and then I open ready made bottles for any night time feeds. Tonight due to lack of sleep and doing it in the dark so as not to disturb my husband I grabbed the remainder of the 10.30 feed instead of the one I'd just made up with the ready made stuff. The rest of the 10.30 bottle should have been thrown away and I used it after 6and a half ish hours. Feel awful and stupid. I know we now have to watch out for symptoms of enterobacter sakazakii infection - just wondered if anyone done anything similar and also was their baby ok.