Breastfeeding does reduce odds of conception but it doesn't really last more than a year. Plenty of people get pregnant while breastfeeding.
I dunno, original poster mentioned scant nutrition being a condition for an extended effect so mayyyybe, seems like it would not be very hard to study today.
I dunno, original poster mentioned scant nutrition being a condition for an extended effect so mayyyybe, seems like it would not be very hard to study today.