After 10 years, the wife starts to think their kid looks kinda strange so she decides to do a DNA test.
She finds out that the kid is actually from completely different parents.
Wife: Honey, I have something very serious to tell you
Husband: Whatís up?
Wife: According to DNA test results, this is not our kid
Husband: Well you dontít remember, do you?? When we were leaving the hospital, we noticed that our baby had pooped. Then you said: - Please go change the baby, Iíll wait for you here. So I went inside, got a clean one and left the dirty one there