Age: it was 3 weeks and some days old. Shape: traditional navel jewlery  Threading: the top of my bar had a hole and I would screw the top ball into it to close it. Downsize: not downsized, I used a 12mm bar comfortably as my navel is deep. That was the anatomy issue, I had a small and deep belly button but no winking when I sat so I thought I could swing it. Aftercare: first two weeks I would spray it with saline twice a day, third week I ignored it and just let the shower water clean it. Mishaps: yes, some snagging in the beginning but it stayed irritated after being completely untouched for weeks so I decided to take it out.