Any puppy can be aggressive it mostly depends on how you treat it and how you play and interact with it. Never play tug games with a dog if you can't win, you will only be teaching them dominance, be firm but kind and never ever hit your dog, that will lead to fear and aggression on your dogs part. As long as your clear who's boss without any hitting and make sure you teach basic training everything should be fine.
There is a huge misconception about pitbull puppies being dangerous. Some of the experts clearly deny and disregard this very schema, terming it as highly ludicrous. As a matter of fact, some people have even gone to the length of issuing a declaration that in lieu of pitbull puppies having a problem with humans, it is actually the other way round or more precisely they state that it is actually the human who has a problem with the pitbull puppy. In the support of this stance, some backing points have been presented in the term of pitbull puppies, which illustrate the entire design of their mindsets.
For one, pitbull puppies are known to be highly vivacious and possess a plethora of energy, which always requires an outlet to be channeled out. The failure on the owner's behalf to channel out that energy in the right and accurate manner is actually the main problem that leads to negative or more precisely aggressive behavior on the puppy's behalf.