Pros:

• They look marvelous.
• You can combine and match the jewels efficiently to accommodate your mood.
• They aren’t extremely uncomfortable to get pierced.
• You can nevertheless keep them when you’re expecting (with unique jewelry)

Cons:

• Not everyone can get a belly button or navel piercing (e.g. if you have an outie – read above for more information as to which navels can be pierced and which cant!)
• The position suggests they manage to move about a lot with your body move (e.g. sitting) and may take longer to recover, or not improve at all. This largely affects people with bigger stomachs.
• It’s not very obvious to see guys carrying belly button or navel piercing.