To be honest, You did a great job with the B&W conversion, but the pink diaper distracts from the image.
Selective desat, should bring focus to your main subject. In the case the babies face. Now, I think I can give you aretistic license (maybe you are showing she's a girl). So, I'm not gonna count off for me being distracted by a little thing :-)
It must be of course, because of the colour, huh? The selective de-sat has an adverse effect on what might otherwise have been, to me, one of the more interesting baby shots I've seen. It'd even be more interesting if you'd said it was a boy. Maybe it's effective around here, but I prefer to make my own stories from an image - I believe that's where the magic lies - rather than to be slapped around the retina and told what's most important like this.
Nice capture but I think it's a little cool or dark. I think to see it in brighter or warmer tones. But then again that might make it too ordinary. Don't change a thing!