Single parenthood, a truly modern nightmare. Though the real modern nightmare for men would be never seeing their kids (if they are even theirs), while paying 80% of their earnings in alimony and child support.
Really it's the kind of thing where you use a formula the audience recognizes and rely entirely on art and character design to make the story stand out.
idea: the reason she said she wouldnt forgive him isnt cause he knocked the stroller its because she recognized him as the dude that got her pregnant and bailed
then she followed him home and left his baby on his doorstep