I'm Sad

So Mr. Ayden has been talking up a storm lately, he is by far our most vocal child. I don't remember the girls being as talkative as he is. His vocabulary includes "Dada", "Sissy" (He says it when he is looking for Ashlynn or Izzy), "BaBa", "KeeKee"(for Kitty), "NumNum" (for when he is hungry) and will try to copy you in what you are saying. But the kid WON'T say Mama :( I can say Mama all day long and he always comes back and says Dadadadada. I am the one that brought him into this world and I am the one that is home all day with him, so why can't he give me the satisfaction?? :(