mine is a formula piglet! i have to go to target today to buy some more large bottles as when i make up a 120ml bottle i always have to make more! i am not worried though as she is chucking still (fingers crossed the medicine starts to work soon) so losing some of her feed, plus she goes a lot longer than two hourly. three hours before feeds would be the absolute minimum and through the night she goes from about 9pm till 6am.