A new Bobby

It seems Ethan has forgotten how to say the "m" sound, except when he is upset.  He used to say "Mama" but recently if you ask him to say Mama, he says "Baba".  If you ask him to say Mommy, he says "Bobby" or "Boppy".  If you ask him to say Moo, he says "Boo".  It's all very cute.  Today he reached for me and whispered "Bobby".  It melted my heart.  When he's upset or tantruming he'll yell or whine "Maaa"  or what sounds like "Mom mom moommm" but only then do we hear the "m" sound.  I have no idea how long this phase will last but I don't mind being his "Bobby" one bit.  Actually, I love it.