LO rolled from tummy to back for the first time thus morning, and he did it in my fall break so I was actually here to see it. Yay! He's 17 weeks today.
Yay for seeing it! My DD has mastered tummy to back, but she has not done back to tummy. She will flip from back to side, but never rolls the entire way to her stomach.
Re: Rolling
DS born 6/2013