Jess babysits Russell's pre-teen daughter for the weekend and meets his ex-wife. Then, Schmidt and Cece panic when they think she's pregnant. Also, Nick's new girlfriend may be too young and Winston discovers his new boss is a big baby.

When Jess and Nick run into their exes Paul and Caroline, the gang fears they both may "backslide" into romantic relationships. Meanwhile, Schmidt desperately tries not to get aroused as he deals with a delicate medical issue, Winston suffers the consequences of a wild night out with his boss and Cece brings Schmidt to a nursing home to meet her grandmother.