Blowing in her sippy cup???

So the new thing today is blowing. Layla woke up early and I tried to put her in bed with me with a bottle hoping that after I could get about an hour of sleep...Layla wasn't having it. She was laying in bed blowing .... I am not really sure what this is about...I guess it is just a new sound she figured out?

Tonight I gave her some water in a sippy cup and she was blowing into it. LOL