As a dog person (obviously, see avatar) this is very sad to hear. But as some have touched on already... pitbulls are not a "killer" breed of dog. Despite what they have been forced to do by people, they are an amazing breed and one of the best pets society could have. Shit people create shit dogs and that usually leads to tragic endings.
The folks here salivating at the thought of gouging out there eyes and killing the dog are disappointing beyond words. I don't care what breed you have or what your preconceived beliefs of breed behavior are, there is far more science and education out there proving it is our (human) interaction that creates the issues, not the breed.
I feel terrible for the child... and now also for the subjective view of the breed as a result.