Aargh! Just deleted a long message!
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Anyway, when I looked into this a while back, I was told that nursing only causes oxytocin production when your body is otherwise primed for it -- i.e., the first few weeks prior to birth and again close to birth. My own experience has borne this out.
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I am 27 weeks pregnant with #4. #1 was 5 months old when I got pregnant with #2; #2 was 15 months old when I got pregnant with #3, and #3 was just a year when I got pregnant this time. #1 was heavily supplemented with formula during the second pregnancy because my milk supply tanked and he really was dependent on it. #1 nursed through pregnancies 2 and 3, weaning at 3.5 a couple months after #3 was born. #2 nursed through pregnancy 3 and halfway through pregnancy 4, weaning also at 3.5, when I was 20 weeks pregnant. #3 is showing no signs of weaning, and I expect I'll be tandeming again in a few months.
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Throughout my pregnancies, I have had no contractions from nursing until the last week of each pregnancy. I have a ton of strong BH contractions, but not tied to nursing at all. However, about 5 days before I gave birth (both times after my due date) I started to have "real" (i.e., not BH) contractions during nursing. They got worse over the next few days, and then I'd have contractions during and for 1/2 hour after nursing, and then labor would finally start. Once labor started, I couldn't nurse anymore because it was just altogether too painful.
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I'm confident that incipient labor caused the nursing/contractions interaction, not the other way around, because of the timing of it all. There were no nursing-related contractions until I was 40+ weeks.
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