I wonder at what point in the life of a parent the reference to self changes from "I" to "Mommy".  I for one can't remember a single instance of either one of my parents referring to themselves in the third person.  I think that's good.  Referring to yourself like you're the external narrator of your own life story is weird.  And what must kids think? 
Mom:  "Mommy doesn't like cheeseburgers." 
Kid:  Which Mommy is she talking about?  Her name is Mommy, but there are a lot of Mommies out there.
#language