'ba' and 'da'

In this video I am teaching Zoe how to say 'ba' and 'da'. I had been doing this with her for two days--this video is on the second day. The next morning she woke up saying 'da' then two days after that she started saying 'ba'!

She still laughs every time I say 'ba' or 'da' to her. She also gets the biggest smile on her face when I sing the alphabet.