Am going to combi feed...without anyone moaning basically so i can ease it off of me every now and then. as its not going to be often i am stocked up on cartons of sma. But...she is still feeding at least twice throughout the night..can i take a couple of bottles to bed with us with the carton and just use them during the night. how long can milk stay in the bottle for before you have to bin it? eg i fill a 6oz bottle but she only drinks 3 oz, do i need to check the remainder, or after how long? x