Though most adults take it for granted, learning repeatable biped motion is actually quite difficult. Just the act of standing requires continuous, unconscious, sensing and adjustment to keep from loosing one's balance. In Ronan's case, his control system often dumps the feedback signal after a second or so, ending accurate corrective actions and preventing homeostasis.
Ronan's numerous bump and bruises are a visible reminder of how mastering this skill is a struggle. On the other hand, he seems determined to walk and takes great joy in the effort applied during this learning process. He's becoming adept at using props to aid in motion; in the video above you can watch him use an empty box as a walker. He started this about two months ago, and is now using other objects- chairs with wheels, little wagons, laundry baskets- anything that will slide easily on the floor.