Weaning

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I’m trying to slow my supply I hope of drying up and switching baby off the boob. What’s the best way to do it? I normally nurse her 8-10 times a day and pump 1 or 2 times a day. Should I juts pump twice a day and feed her that milk and skip the nursing session? Or feed her formula and pump once a day? How long should I be pumping for 30 minutes or less?