This is all I've heard all day. DS has learned how to vocalize. He "da da da"s EVERYTHING.
He's excited: da da da da. Tired and Cranky? da da da da. Hungry? da da da da. The cat walks by? da da da da.
I have to admit, it's hella cute. 
Momma to three boys:
Henry - 4yo
Alex - 18mo
Jack - born 2/23/12 at 20w due to ruptured uterus (previa and accreta resulting in hysterectomy)
He only lived here on Earth for an hour, but he will live in our hearts forever.
m/c #1: sept '09, m/c #2: july '10
Re: da da da da da
DS1 born June 2008 | m/c at 9w March 2011 | DS2 born April 2012
My son does the same thing...too cute!