I'm 5m pp. I lost 50lbs the first few weeks. And haven't lost any since. If anything, I've gained 5lbs.
I plateaued around 4 or 5 months pp but once I stopped breastfeeding entirely at 10 months old, the remaining weight just dropped off me. I lost around 11 pounds in a month. Nothing about my lifestyle changed, only stopping breastfeeding, so I put it down to the change in hormones It happened with my first baby too who's now 4yrs old. Once I stopped BF'ing him, the extra weight just fell off. Again no major lifestyle changes.
I pumped and then exclusively breast fed for 17+ months and saw that I lost weight in the first 2 months pp then ended up gaining weight. I have had so many issues loosing any weight while breastfeeding