5 3/4 months old. Ally is just learning how to sit up all by herself, but she still tumbles over sideways about half of the time. She's still not a big fan of tummy time as you can see by her pouty face in the picture. We keep trying anyhow. This past week was a big time adjustment because of daylight savings time. Fall-back meant that Ally wanted to get up everyday an hour earlier and go to sleep an hour before we're ready for her to go down.