This movie says so much more than what is on the surface. Marlo a mother of 2, with one on the way is handling things just OK. The added stress of a newborn, a special needs kid and a darling girl tries to keep up. And true to life - things start falling apart. Her brother, with whom there is a not the greatest relationship, offers to get her a night nanny and it takes her awhile to take him up on it. And her life changes after first night of good sleep - and she and has a new friend too.
She starts being able to handle her sons needs, take care of herself and slowly you learn what is behind it all.
Many men and woman (who have not had children) do not understand the post-partum time - it is not easy all the time and with so many things on the plate of a mother with more children - it is hard.
I was not prepared for the last part - but I am sure I will be thinking of it for quite awhile. To me a good movie is one that I still think about weeks later. I loved Diablo Cody's writing - again.