Wow, researched much? I have a Staffordshire Bull Terrier crossed Labrador, he is the most docile and lovable dog I have owned (Have also owned SpanielxCollie, Mini Dauschaund and and a Lurcher.)

"They have strong nursing instincts around kids and have earned the title "nanny dog" in English homes." link

Often cited as a brilliant breed "If people think that Staffies have problems, they're looking at the wrong end of the dog lead! When well cared for and properly trained they can make brilliant companions.” link

It is the owners who over breed the dog and treat them poorly that make the dogs aggressive, however no dog should be left alone with a child under any circumstance, that is just being irresponsible. Most pets can severely damage a child a dog especially.

Edit 1. Thought I should add my 2 nephews (currently 1&3) love to play with my dog, he gets poked and prodded, gets climbed on and has been bitten by the youngest but just sat there throughout it all wagging his tail, we are always in the room with them but he loves the kids.