My Dr also recommended that I do not use it. BUT here is my thoughts...
I have an almost 19 year old son who never used one but was bowlegged and had a tunred in ankle. Hmmm- wasn't a jumperoo that caused it then!
I have a 19 month old daughter who used it and is fine. The best part was the fun she had in it and watching her learn to bounce and the giggles and grins we got while she was in there. I wonder if it was more fun for her or us! lol She would probably spend 2 hours a day bouncing around.
If you do decide to get one make sure that it has adjustable heights so you can change it as he grows. The worst thing was I could not change it and she went through a growth spurt while on vacation. I put her in it and just figured I would have my hubby adjust it when he got home- well she bounced and jumped and played for awhile and got all excited and jumped so high then when she came down her butt almost touched the ground but her knee hit the tray that went around her. Small bruise and a few tears but she was fine! Scared me more! lol
Good luck to you in whatever YOU decide!
Blessings!