Night pumping
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In the UK, we have the rule of 6 - 6 hours at room temp, 6 days in the fridge and 6 months in the freezer. Technically you could but I think the milk would dry in the pump. It’s worth just checking your pump before using again x
Sometimes I’ll do this if I know it’s gonna be a couple of hours, but any longer than that I think the milk will get all sticky in the pump parts. You can just rinse them off and stick them in the fridge, rather than wash them between night uses. I know a few people do this! I wash and sterilise (or at least rinse and sterilise) each time as we have a UV steriliser and so it’s pretty easy to stick them in there and it dries them too. I know plenty of people only sterilise once a day though and just wash or rinse between uses
I've only seen leaving it out for 4 hours, but I'm not sure if it would start getting dried onto the pump. What I do is throw the pumps in the refrigerator and use them for a day or so without washing. The milk doesn't dry onto the pumps as fast.