Lol I had that & they fade away now I'm pregnant again I'm sure will have it again.
I did some exercises b4 & did some sit up 200 a day it helps..
I got a wrinkly belly after my first...think its cos i was so huge, the skin just couldnt bounce back. it has got better over (a long) time though. dont suppose theres any way of knowing beforehand though.
I actually have a better stomach after than before. It's tight and firm
I have two kids and i didnt get no wrinkley stomatch.. jus a lil pooch like if i was bloated..
And excercise helps to tighten it back up after you have the baby.
As for knowing if you will or not, that can't be predicted beforehand. You just gotta wait and see.
Wrinkly belly? Almost every female will have a pooch after they give birth, and the stretch marks might make it looked wrinkled. It gradually will get better as the extra skin and such tightens back up.