I've been trying off and on to get Brianna to say "Dada" on video for me. Below are two videos where I think it's pretty clear. I think I'm a little annoying in the videos, so please excuse that!
I had to laugh while watching this one... the last time she says it, it sounds like her tone says, "Okay, if I say Dada will you just let me play?!?" Also, she's not crawling quite yet, but you can certainly see how close she is to taking off.