There is no such thing as "ma-ma" in this house. We're both "da-da" and the actual "da-da" is the clear fave. If Matt leaves for work when Jack is not distracted by, say, breakfast I'll have 2o minutes of a screaming, tantrum-throwing child to deal with after the door closes. He gets pissed if I leave him in a room but he never gets excited when I enter it. "Da-da" gets all the perks there.
I do maintain the single greatest advantage of the "da-da" preference is that whenever Jack has a choice I get a break.
I'll take what I can get.