Mine popped out as soon as I started to show. I used to have a really shallow inny, but then with my first pregnancy it came close to popping out. Around 6 months or so it really started hurting all of the time and when I had my midwife check it, she told me it was an umbilical hernia.
She told me it would get worse before it got better and that I could no longer pick up heavy things like for instance, my daughter.
In fact sometimes If I do lift up heavy things, it bruises and turns ugly colours.
I have been talking to some others who have had the same issue and they say that although it does sort of go in a bit after the birth, it never returns to a full "inny"
c'est la vie- right. perhaps when I am all done having kids, I'll have it surgically fixed.