Sitting up

Everyday now we do a little tummy time and a little sitting time. I lay him under his play gym on his back, he lays there for a few minutes but then will roll onto his tummy play there for a while looking at himself in the mirror or just looking at the brightly colored pictures on the mat. He moves around in a circle and pushes himself backward but still not much int he forward department. However it won't be long, he pushes himself up high with his arms and pulls his feet up but he doesn't push with them yet he just lets them go and plops back down onto his tummy. After he gets tired of tummy time I sit him up on the edge of the play gym. He sits up all on his own for a few minutes at a time. Sitting close to the gym he will grab for the hanging toys and grab onto the bars that the toys hang from. The bars are soft and springy so he likes to chew on them a lot. He will fall over a few times but likes to sit up so much that I sit him back up and he will sit up again for a few minutes before topling over again. He will do this three or four times before becoming tired of sitting.