Look what Grandma and Grandbeebsy got Colin for Christmas! A Jumperoo!!! He's getting the hang of it quickly. I had to put a pillow under the seat so that his feet would touch (whatever works, right?)
It gives me another way to entertain him during the day. I highly recommend this to anyone who needs to burn some 4-month-old energy.
UPDATE: After a couple days of practice, look how much fun he's having now...