Conversation so far:
When does Jim pretend to propose to Pam
In the Season 5 premiere of The Office Jim proposes to Pam in the pouring rain at a rest stop, saying that he can't wait.
Did Jim and Pam get married in The show The Office
In Season 6 of The Office, Jim and Pam are married in the season's 4th and 5th episodes.
Did Jim and Pam's family grow
In the television sitcom The Office Jim and Pam have two children, Cecelia Marie Halpert, and Philip Halpert.

Question: In what episode was the second child born
Self-contained rewrite: In what episode of  The Office was Jim and Pam's second child born