Well right after the piercing is done sometimes there can be a little bleeding, rare but it does happen. If you have had the piercing for a few days this is just a reaction to bumping and cleaning and the bleeding should stop fairly quick. Remember it's a new hole so yeah bleeding could occur, once the tissue starts to knit the bleeding will stop and the piercing will heal up. Now be sure you are cleaning it well and properly, don't over clean as this can lead to further issues down the road.
As you would without a navel piercing, just be sure the navel piercing is the last thing you clean before you exit the bath.
Your question "Can navel piercing migration be down to growth" makes no sense.
I can't say my navel piercing/anti-navel piercing is sore, thanks for asking. >_<
Its not just navel piercings that can reject, its all piercings! Its a risk you take when you get the piercing done. Your body simply sees the piercing as a bad thing and pushes it out, You can try again with the piercing but it is not recommended in the same place.
She can still keep her navel piercing in.
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.
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)
it is a plastic piece you put in to retain your navel piercing
Navel
A navel is the area around the "belly button" otherwise known as the "umbilical knot". When people refer to a "belly button" piercing they are actually referring to a "navel" piercing.
clean the blood off.
it is a plastic piece you put in to retain your navel piercing