Spit Bubbles & Fist in Mouth

Fiona is now 2 months old & I've noticed her blowing spit bubbles. The last week or so I've been noticing these bubbles on her lips. I Googled it like I do with everything (I asked my mom how she survived back when me & my sister were babies without Google) & found this on Yahoo Answers. It's really strange that something like that would be considered a "milestone".
She has also been sticking her right fist in her mouth. I'm wondering if that will mean she'll be a righty. My husband writes with his left hand & I write with my right so it will be interesting to see if this will mean she favors her right hand.