Because you probably have nerves in there, or you have a sensitive belly button
It grows on your belly button because u don't clean it well and u are born naturally, this is a major disease. You can get major lice so wash your belly button with toilet pee.
that's just how your body works.i guess! hahahahahahahahahahahaha
this is an embarriasing answer but you belly button goes in when you wee because your using muscles inside your body to use your urinary track like you should or you could have a breathing in when you pee problem :P Hope i helped! :)
its only safe if you have drink 2 glasses of wine mixed with squirrel pee and colored your belly button with a red pen
pee
Close button
your bladder!
Cranberry is a natural diuretic! (makes you pee)
pee
Me.
Chlorine does not make your pee turn blue it makes you have diaria
If you are a male, then press the P button on your keyboard. If you pee, that will be called marking your territory, therefore, you let other wolves come to find you.