I'm just under 5 weeks pp and I have already lost all the pregnancy weight as well as a few extra pounds lighter than my pre pregnancy weight (so in total I've lost almost 20-25 pounds in the last four and a half weeks. This was my second baby and I'm a little bit baffled. With my first baby I gained a lot of extra weight and then never lost any of it, and so this time losing not only the baby weight but also weighing less than my pre pregnancy weight is a little concerning to me, is this normal or is it something I should maybe ask my doctor about? Another problem I've noticed having lost so much weight so fast is that I seem to have a fair bit of loose skin around the belly area and have no idea how to help tighten it up, or if it'll start tightening up on its own it's a bit more time since I am only about a month pp. Any tips or suggestions would be greatly appreciated.

TIA