You can't have a dog with a history of biting people, especially an owner, around a baby.
Here is the reality of owning a Pitbull... If you acquire from a reputable breeder, you are going to get a well bred dog who is energetic, loyal to the family, adores children, does not take to aggression against humans but is animal aggressive. These are the things pit bulls were traditionally bred for. You are going to have to spend quite a bit of time with it to make sure it develops properly and has outlets for its liveliness.
If you do not, you cannot be sure how the line was bred. There could be rampant inbreeding leading to genetic defects, even brain damage(which can lead to aggression out of the blue). The dogs could have been bred for brutality, which means you will be fighting against breeding to have it be peaceable around humans. Of course it could be the nicest dog in the world, but you just don't know what you'll get.
If you want to get a pit bull, buy from a reputable breeder, or, even better, the local animal control/pound/shelter/etc. where they do behavioral tests to determine whether the dog is ready to interact with humans positively.
Also, if you look at list of dangerous dogs compiled by nations that keep stats on that stuff, there are a lot of others just as bad. Chows, huskies, Akitas. Even corgis!
You can see when you look at the types of dogs that they tend to fall into certain groups. Corgies are heelers, so it makes sense that they can be bold and nippy.
The fact is babies and kids can stimulate the prey drive in any dog, especially dogs in groups, and you can't leave them alone with them.
And another problem is that some people will always want tough, scary dogs, and they will breed whatever the current "tough" dog is to produce what they want. Pit bulls are it right now,not long ago it was dobermans. 50 years ago pit bulls were considered good family pets. If one breed becomes illegal, people will find another one.
Really effective licensing, breeding, and spay/neuter programs go a lot further than breed bans.