ITA with pp's. Cut yourself a break. You just had a child; in body time it was a *very* short time ago. Your body is just gearing up to the high metabolic level it needs to sustain nursing. And you don't need to be dieting right now - it will interrupt your body's processes (that take at least a month, more like 6 months) to get breast feeding stabilized. Start dieting too soon and you'll find your milk supply drops *fast*.
And it's also true that the weight lost during the first month is almost allll water-based. One reason I've heard for this is that your body ensures that you and your baby can draw on an energy supply while you're still healing from birth, so it doesn't start burning fat until later.
Either way, I'm sure you look lovely. Enjoy your babymoon and worry about the weight if it's still there in a few months. (Though I'm betting you'll see the weight start to drop off soon.)
GL!
-Ivy
Parenting two active, wonderful boys
This is your world. Shape it or someone else will. -Gary Lew