I was actually looking to see if this was yours. I thought maybe so, but the title threw me. I never got around to voting in this challenge, but this is cute.
I completely predited that you were going to enter this challenge and with this exact kind of shot! I'm laughing.... that's soo funny! Great shot, and cute butt! I agree with karmat that it needs a slight bit more contrast.
This is the best baby shot of this challenge and a nice interpretation of high key IMO: no blown highlights, good overall tone and a bit of reflection on top of that.