MacKenzie Nielson is the type of kid who's always in a hurry. She's always the first one out the door and the first one into the car. And back in 1994, the Finch Elementary sixth grader sure didn't want to wait to make her earthly debut. MacKenzie was born March 9 in the front seat of the family's red Chevy Cavalier as her parents and twin sisters raced across the Monroe Street Bridge toward Deaconess Medical Center. Dad, Rob Nielson, knew his new child had arrived when the two girls started chanting, "Baby, baby." Mom, Tera Nielson, knew a whole lot sooner that MacKenzie Lynn wasn't going to wait for a doctor. "I realized it when we got in the car — that she was going to be born in the car," Nielson said. Nielson had gone into labor the night before, but had fallen asleep in her waterbed.