Becoming untied.. thanks for "defending" me :)
I don't mind at all, but I do have to point out that we are BOTH wrong.. my original method will probably blow your whites, although not as much as your method does. Yours looks great digitally but I'm surprised you say it prints well because no lab recommends sending files with large blown areas (areas with 255 in all channels, complete loss of color/detail) because what happens is that no ink goes on the paper, so even the texture looks different.
The wonderful thing about photography is that no one stays static in their learning process, so there are several tutorials with methods I probably wouldn't use anymore, and this is one of them.
Now I would probably use the quick selection tool and select everything around baby and then do a selective coloring adjustment layer and select the white from the drop down box and then adjust the black slider up. But I would keep my eye on the info palette and avoid going above 245 on any channel.
Again, I think this look is great on the web, but be warned that it may not print well, at least not at a pro lab where what you send is what you get back. If you print at costco or sams what you get back is anyone's guess :)