Belly Button and Marble Trick?

I have to say, I've never heard of the "marble in the belly button" trick. Swelling after a tummy tuck is influenced by multiple factors including whether liposuction was used, whether the deep fascia is preserved, the degree of undermining, etc. It is not unusual for swelling to last 3 months. However, like most issues with recovery, every patient is a bit different. Compliance with postoperative compression garments, activity restrictions, and maintaining a healthy, low-salt diet all hasten the recovery from swelling. Follow up with your plastic surgeon as advised and be patient.

Belly buttons can look funky for a while but your surgeon has a good idea of how its going to turn you.  If you're thinking you need a marble to hold your belly button open, you're worried about stenosis.  Simple revisions can remedy that.  Still, talk to your surgeon about your concerns and how best to manage.  I can't imagine that having to surgically remove a belly button improves any scarring.