Re: cutting night pumping
You can try not pumping a full amount - leaving some milk in your breasts. Doing this several nights in a row will tell your body that it doesn't need to make as much at this time of night. I'm adviising you to go slow on removing the night pumping, since you said you're prone to plugged ducts.
Eventually, you'll be able to cut out the night pumping altogether. I know it's hard! Your supply the rest of the day should be unaffected by removing the nighttime pumping.
Once baby starts sleeping through the night, your body will figure out that it doesn't need to make as much milk as this time, and will slow down production. Breastfeeding is a supply-and-demand process - if you (via the pump) or the baby doesn't remove the milk, your body will slow down the milk making process during that time of day.
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