I need to leave my 4 month old DD with my MIL for the day in 2 weeks time. She is EBF and she has acceoted a Nuk bottle with freshly pumped milk in before but only several times as a test. I have never tried her with pumped milk warmed from being in the fridge for example (which I am planning to do to make sure she will accept this) and wouldn't have the first clue how much milk she would need for around a 7-8 hour daytime period as I just feed her on demand and some days she feeds more than others etc.