Re: Lactational Amenorrhea Method
I used LAM (the second set of rules posted) and didn't get pregnant. It wasn't hard to follow--DD nursed frequently and would never take a pacifier or bottle.
The first set sounds more like Ecological Breastfeeding to me. It's a stricter variation.
Here's what Kellymom has to say about both: http://www.kellymom.com/bf/normal/fertility.html
Catherine, tandem nursing mama to Preschooler Girl 9/08 and Toddler Boy 3/11
Breastfeeding for 4 years and counting!