Can you say Mama?

Does it mean anything about your skills as a mother when your child refuses to say Mama? Bryton constantly says "Dada", but "Mama" almost never! I know he can say it, because I've heard him say it before, but for the most part it's just "Dada, Dada, Dada"! I know "Dada" is easier to say, and so usually comes first, but sheesh!It's getting out of control. This is a snippet from a little "conversation" Larry and Bryton had yesterday.
Larry- " Say LaLaLa"
Bryton- "LaLaLa"
Larry- "Say Yaay!"
Bryton- "Aaay"
Larry- " Say Mmmm"
Bryton- "Mmmm"
Larry- "Say Dada"
Bryton- "Dada!"
Larry- "Say Mama"
Bryton- "Dada!"

Sniff.