A slack LAM worked for 8 months here - wasn't exclusively trying to avoid though, the EBF just did it! Started solids at 4.5m and had been sleeping through the night for forever (all except the first months).

Not exactly. I was on the mini pill for the 6 months LAM is considered effective. And got off the pill at 6 months. But I still didn't get pregnant until my first was 12 months, still breastfeeding and no period. And my second was 13 months, also still breastfeeding with no period.