Ronnie's New Sound

So, I'm not sure where or how he learned this, but Ronnie has a new sound that he does now all the time.  He purses his lips together and then hums/blows/spits/gurgles/talks this funny little sound and it is so funny!  I just absolutely love it! He really does it all the time especially when he is getting his diaper changed and after he is done eating.

 I love how it makes his cheeks look so cute!