As New York plays host to swarms of horny sailors, Miranda tries to cope with how her new baby impacts her life. Meanwhile, Samantha considers making up with Richard.
Miranda and Steve decide to have Brady baptized. Meanwhile, Samantha struggles to give Richard the benefit of the doubt and Carrie gets unexpected news from her editor about the future of her column.
On the trip to Atlantic City the ladies take to commemorate Charlotte's 36th birthday, Carrie's desire to bond with her girlfriends runs into conflict with Miranda's erratic stamina, Samantha's jealous possessiveness over Richard coming to a head and Charlotte's desperate rejection any notions that she's becoming an old maid.
While Carrie is afflicted with writer's block in her attempt to come up with a cover concept for her new book and Miranda makes a new friend in her desperate attempt to lose weight, Charlotte turns to a self-help book to help her deal with various relationship issues and Samantha's sexual indulgences cause a rift between her and Carrie.
Carrie starts to panic as her book-launching becomes a major social event while Samantha suffers such a bad reaction to a beautification process, she considers skipping Carrie's big night. Elsewhere, Miranda contemplates letting a few dates go by before telling potential suitors she's a new mother and Charlotte battles with her ex-mother-in-law over possession of her marriage home.
To everyone's surprise, Samantha turns out to have a talent for babysitting. Meanwhile, as Charlotte goes to bat for her apartment, Carrie frets over the negative impression of her that Aidan gave his post-Carrie girlfriend.
As Charlotte tries sleeping with someone she doesn't love or even particularly like, Carrie's highly-anticipated romantic weekend with Big has an unexpected conclusion.
The ladies go to the Hamptons to attend the wedding of Carrie's friend - whom they're nearly certain is gay. As Charlotte finds herself with unexpected feelings for her lawyer and Miranda and Steve's relationship deepens, Carrie finds herself breaking through the awkwardness with Jack.