So my BM is sterile and can be left out of the fridge for 6 hours. Have small bit of milk in pump and need to give it a rest. Do I need to put the milk in another container and sterilise pump for next time, or can I just stick whole pump in the fridge and top up what I have expressed in 2 hours? If my BM is sterile for 6 hours out of fridge, a couple of hours in the fridge should be ok right? I've been sterilising it between each express and think I might have been creating extra work for myself!