You were smiling after a hard labor of your newborn babyson. That was a result of a bad assault from the riddler.

Long story short you were on patrol one night until you got outnumbered by the riddler's henchmen and well you look too good off that domino mask so the riddler couldn't help himself.

one night in you were in your medical bed your baby besides you as you just finished feeding it. So on, you weren't surprised when you felt an aura around.

"He looks like me." Edward says dryly.