We made about 5 or 6 bottles up with formula and water every night to go in to the fridge for the next day.

Heating times depend on the amount of liquid and the wattage of your microwave, but once you get the magic number it's easy as.

We zap a 240ml bottle (cows milk) in our 1000w microwave for 53 seconds and as the others have mentioned, without the lid pushed on or take off completely, plus give a good shake.

Good luck