I think the hat was casting some yellow color on your white background. Playing with Selective Color and Curves helps to eliminate the yellow cast. Once you've eliminated that, you can boost the yellow back up in Hue/Saturation. Add back in the Contrast via Brightness/Contrast, and you're good to go.
I do have to say something about the fishing net. While it's a very cute idea, you have to be careful of the perception of fish net on skin, especially where the net is hitting the leg on this kid-o. Before I recognized that it was an actual fish net, I had a quick thought of "why is this baby wearing fish-nets??"
Awww- Really want to see the top of that crazy hat and the hands too. I love little hands so I need to see them badly. I'm sure that was a great and memorable photo shoot as well. Nicely done.