My daughter is 9 weeks and hasn’t had a formula bottle since 4 days ago. A NICU stay and HELLP syndrome messed us up but we are back on track now. I never BF exclusively before. I have to go for testing tomorrow because of the lingering health issues and my friend will be staying at my house with her. I managed to pump 5 Oz yesterday and hoping to do the same today so she’ll have about 10 Oz tomorrow while I’m gone in the morning. Do you guys bag milk by 4 or 6 Oz? How long after warming it up is it good for?