Looking for advice! Nhs website says to make up each feed when you need them. I have been feeding ready made formula but that's too expensive so looking to change to formula. I don't want to use perfect prep machine, I have been advised not to as my baby is premature and also has bad reflux and trapped wind which I've heard the perfect prep can exasperate. Do you really have to make the feeds up during the night?? Cooling the kettle for thirty minutes etc?? Or is it ok to premake the occasional bottle. What's the difference between me keeping an opened ready made formula bottle in the fridge for 24 hours (as per the bottle instructions) to pre making a powder formula bottle and putting it in the fridge? I'm confused! But don't want to risk baby getting sick by doing things wrong!