GGB denies it, but I know she heard it too.
We were sitting in the living room and she was on my lap. We were watching something right around 12 and she started squirming. Before I know it, I heard her yell, "MAMAAAAA!" I looked at GGB and she looked at me and we looked at her and I said, "Did you say 'Mama?'"
"That's so good sweetie! Yaaaaay! Do it again! Say, 'Mama."
Oh well. I heard it. She did it. She doesn't know what it means, but I'm counting it.