I am 5'2" at 114 pounds (before birth), size xs or small before birth, Measurements before birth (waist 26, hips 36)
I gained 25 pounds at 39 weeks, and was about 125-130 pounds after birth, Measurements after birth (waist 29, hips 38).
So I purchased a size small.

I have tried many different belly bands right after giving birth to my baby.  (I had a vaginal birth).  But nothing works or fit right.  I have tried
1. Gabrialla Breathable Elastic Abdominal Binder for Women $39  (size xs)
2. Wink Flats Post-pregnancy Belly Compression Postpartum Girdle $89 (size small, medium, large)
3. ShrinkX Hips $59 (size xs)
I tried all of the above right after birth for about 2 weeks and did not see any results.  The Wink Flats Post pregnancy Belly Compression Girdle, I could not even get into (no matter what size I tried on).  There was no zipper with this design, just a slip on design and it kept getting stuck on my shoulders.  The ShrinkX Hips was very uncomfortable to wear and it keeps riding up when I sit down.  And you cannot wear it under your clothes (even though they claim that you can).  It is so thick around your waist, you can totally see it underneath your clothes.  And the Gabrialla Girdle keeps bunching up and does not fit my torso.  Cannot be worn under my clothes.  And so uncomfortable.

So I returned everything.  And I felt very sad, depressed, frustrated, and hopeless.  Because these seemed to be working for other women, but why can't it work for me?  And I could not find anything else on the market that did the job either.  And I went without using anything until my baby was 4.5 months old.  But one day,  I was reading an Amazon review for another product and there was a lady that had recommended the Bellefit because she had a similar experience to me.  And right away I ordered it that day.  Item arrived really quick.  (ordered on a Thursday, got it Monday morning).  I paid $120 for it but it was definitely worth every penny.
The size chart was spot on!  Hurray!!  Finally a size chart that actually didn't lie to me.  I know that with most of what I have read out there and with other belly band products, they say that you have to use within up to 8 weeks after pregnancy.  And after 8 weeks, they pretty much tell you that there is nothing out there that will work.  So I got really discouraged at the 4.5 months postpartum mark.  I thought that there was no hope left for me.  So I was really happy to have found this product (the bellefit) and it said that even people who used it 8-9 months after they gave birth noticed results.  And for the most benefits, wear up to 6 months after birth.

I tried it on right away after I received it.  And it looked smaller right out of the box...but I tried it on anyways, and to my surprise, it actually fits me!  :)
I had to struggle a bit with the zipper on the side to get it to zip...but it does zip.  You might have to hold the two seam lines together to help the zipper a bit.  But it does zip!
I was SO HAPPY!!!  I immediately went to try on some of my old clothes before pregnancy and boy it felt good to be able to slip back into my old pair of denim (size 3 juniors).  I can't zip my denim up because I still have a little bit to go...but at least I can fit back into them without ripping the pair of pants.  And the girdle makes my stomach looks flat and it can be worn under a tight t-shirt with no problem.  You can't even see that I am wearing a girdle.  And it feels pretty comfortable compared to all of the other brands that I have tried.  I am 5'2" and the girdle sits just right below my breasts line.  And when I sit down, it does NOT rise up or move or bunch up or anything.  It stayed put!  I can sleep in these.

I feel so good and really liking how I looked with the Bellefit on.  I got a little boost of confidence that day.  So I am sure that with this re-found confidence I can be motivated to work out again and get back into shape.  I can't thank the makers of these Bellefit enough.  What are you waiting for, just get it.  You will not regret it!  It's $120 well spent.  That is only about the cost of 3 bottles of diet pills or 2 months memberships to the gym.

I will probably be ordering another size down once this one get more loose.  I know that the Bellefit is expensive but it is really worth it.