Is there any biological reason that makes it harder to lose weight after you've !

Is there any biological reason that makes it harder to lose weight after you've had a child?

I know moms frequently complain about how hard it is to lose weight after pregnancy...I can attest to that as well. I'm wondering if there is a biological/hormonal related explanation? What about women who gave birth say 2 or 3 years ago, but still have a hard time losing that weight? Is there really a setback to overcome or is it just lifestyle that people aren't admitting to? Can any type of weight gain be lost?

There are metabolic and hormone issues that can prevent weight loss, as well as thyroid issues. Sometimes after pregnancy hormone levels do not bounce back to pre-pregnancy levels...