You wiggle your arms and legs and try to push off the ground. You try really hard, but don't get place very quickly. Here's a video taken around 4.5 months of you trying to move.
Just before you were 5 months old you started to be able to scoot backwards. You would push off to try and go forward, but would move backward instead. One day you scooted sideways and got stuck under the couch!
You're mostly just eager to move. You aren't too interested in sitting up. But you can sit up if you're supported, like while sitting on daddy's lap:
