A 4-6 hour block without nursing during the night is enough for many women to trigger return of AF......even a few nights. Some people need 6 hours, but as soon as my son slept a few four hour blocks at night, my AF returned the following month. I suppose as others have said, regarding weaning, basically nurse the one in your arms now instead of hoping for the future baby. If baby is weaned early in the hopes of another pregnancy, and none follows, you may regret the early weaning. I do believe whole heartedly in the minimum two year breastfeeding reccomendation, the data on reduction in mortality and morbidity alone is convincing.
Somehwere, on MDC there was an article I read about the 4-6 hour sleep block (even a few nights) triggering return of fertility....I only wish I could find it.
Is there any reason that night weaning is more effective for triggering return of AF than daytime? We've been working on cutting down on dd's nursing, and so far, we've managed to cut down on daytime nursing to once a day (versus every 2-3 hrs around the clock!). DD nurses upon waking around 7am, then nurses again around 2-3pm before nap, and then again around 7-8pm. Then she nurses a few times at night. The morning and midday nursing sessions are usually quite long. Nights, she just needs to suckle back to sleep. I'm hoping this change will help.
I'm surprised by how quickly she cut down without protest. If she doesn't see me all day, she won't cry to nurse. I do want her to get at least some breastmilk though, for the health benefits.