You know, by holding baby and stepping on, and subtracting the difference?
My 11 month old is a chunk and weighs as much as all the weight I've recently lost. It's amazing to me that I was carrying around so much extra weight!
Sadly I still have 2 babies' worth to lose; I was overweight when I got pregnant and want to get into the middle of my BMI range.
But still! I'm 1/3 of the way there.
It's amazing to have such an obvious example of the weight loss.