Depends on what you eat..and how soon before the piercing. Have you tried asking a doctor or health professional? They're the only ones who could give you a GOOD answer. WikiAnswers may be good for asking about Miley Cyrus' astrological sign or which Pokemon character has a blue nose, but I would trust very few medical answers.
As you would without a navel piercing, just be sure the navel piercing is the last thing you clean before you exit the bath.
On your back or side.
Ya a lot
If it hangs or dangles chances are good that it will retain a piercing. Placing the navel piercing off to the side will be problematic for aftercare and irritation during the healing process. If you haven't had a navel piercing before then stay with something that is simpler to care for and will give a result a navel piercing is supposed to give.
it does that before it heals. just like any other piercing.
Well if you are doing your aftercare correctly you should be getting the piercing wet every time you clean the piercing.
Face up would be best, putting a band-aid over it before you get into bed will protect it.
This means you are piercing your navel .. navel is the phrase for the area above the actual belly button** ( **other wise known as the umbilical knot)
Your question "Can navel piercing migration be down to growth" makes no sense.
She can still keep her navel piercing in.
I would suggest going to the emergency room for medical assistance, if you mean a "navel piercing" then follow the written aftercare instructions provided to you by your professional body piercer. FYI no one does "Belly Piercing", if you find a place that does "Belly Piercing" that's not the place to get your "navel piercing" from. Seriously
No, injection and topicals tend to swell the navel area and bugger up the tissue so that getting the piercing aligned properly is a pain in the neck. Why bother the perceived pain of getting the piercing done is at a point that you want anesthetic for it, maybe navel piercing isn't for you.