I wouldent let a pitbull mix or pure anywhere near my son. One that shows agression, capital nope. Maybe the breed gets a bad rep from the press, or maybe im an uninformed judgmental ignoramus, I dont care.
I am dog lover and can hardly talk about the death of my childhood dog even though it was nearly 10 years ago.
The only dog variety I have met that I might consider leaving unattended with a child is a great pyr:
Lily & Baby - YouTube