My parents won't let me get a Pitbull! HELP!!!!!!

For starters, ask yourself some questions: why a dog (especially if you've never had a pet)? Are you ready for the responsibility of having a dog? Why a large dog? Why specifically a pitbull? Have you done any research on the breed? These dogs aren't for everyone. I'm not saying this because I believe in the hype -- far from it. But some people are not cut out for certain breeds. The is no "everyman" dog breed.

After that, talk to your family. Ask them questions. Are they against you getting a pet altogether? If not, why are they against dogs? Are they worried about the upcoming baby (which is a valid reason)? Do they not feel ready (or not feel that you are ready) for a dog? Are they against large dogs? Are they against pitbulls specifically? Why? Have they done research about pitbulls? Are you even allowed to have pitbulls (or any bully breed) where you live? If so, is there insurance? If there is insurance, how much is it?

It's a shame, but maybe they are cautious about this breed around a new coming infant. These breeds sometimes can be nippy. They are good looking dogs though, My brother owns a pitbull and he's a little crazy, he's friendly but hyper since he's only about 7 months old, His name is Tyson.
I wish you good luck and enjoy your dog if you get one.

You need to think very carefuly about this. Pitbulls can be distructive if not given enought exorsize. They also may take a while to train, as do most dogs. When you adopt a dog you need to be able to give up a large part of your life to fill the needs of a dog. Pitbulls are not the best starter dogs and need someone who can socialize them at an early age and can keep going with the training. With a baby coming into the picture very soon, you may not be able to care for the needs of this dog. While I do love pitbulls, I believe a cavalier spaniel or a papillon might be a better starter dog in your case.
I'm only 13 and not an expert in this field, so you may chose to dis-regard this if you want. This is only what I would do in your case and is not the only answer.