Which Came First - Mama or Dada?

Both mommy and daddy have been making a big push to get Levi to say their name first. He's been babbling all along and sometimes says what may sound like mama or what may sound like dada, but nothing definite. So, do you know which came first? buh-buh. Yep! Bubba is so proud......and to be fair, he's saying 'dada' an awful lot. Mommy feels like chopped liver.