So we bought Matthew a jumper off of ksl for 20$, and voila! he wouldn't jump in it... He would try to walk in it because he was in a walker in NJ, but it took him a week to figure out that he could jump in it. Every once in a while we'd go and bounce the bottom of his feet, so he would bounce up and down, which he absolutely loved, so it was a little frustrating until he learned to jump, but it's all worth it now!
Anyways here are pictures and videos of him jumping. This is the first time he actually decided/learned to jump in it, so he was estatic!
ps. I can't believe how chubby he looks in pictures and videos because I don't really think of him that chubby in person, even though he is! No wonder my back hurts at the end of the day if he's clingy and wants to be carried all the time while I do things one handed.