This is just a thought because I know nothing about this subject, but if you are thinner and leaner this time around, you likely have a lower BMI, right? So you probably need to put on more fat stores for breastfeeding? Do you think that could be what's going on?
At my skinniest, with DD, I weight 98 lbs pre-pregnancy. I gained over 50 lbs with her, my BMI was just below the "underweight" mark. I wasn't painfully skinny, I'm small framed and had nothing in the T&A department.
I lost it all just a few weeks post partum (except actually kept a butt, which was a nice bonus!), it melted off me like butter with breastfeeding.
I was 10 lbs heavier than that with DS, and I gained considerably less weight. All my weight gain in pregnancy this time and with DS is in my thighs and butt, and hopefully like last time, it'll melt off with breastfeeding again this time.
But I would think if you're starting out with a lower BMI your body is going to want to store some fat reserves somewhere for those first few weeks of breastfeeding. What do you think about that theory?
At my skinniest, with DD, I weight 98 lbs pre-pregnancy. I gained over 50 lbs with her, my BMI was just below the "underweight" mark. I wasn't painfully skinny, I'm small framed and had nothing in the T&A department.

I was 10 lbs heavier than that with DS, and I gained considerably less weight. All my weight gain in pregnancy this time and with DS is in my thighs and butt, and hopefully like last time, it'll melt off with breastfeeding again this time.
But I would think if you're starting out with a lower BMI your body is going to want to store some fat reserves somewhere for those first few weeks of breastfeeding. What do you think about that theory?