I don't want to turn my nose up at this episode too hard, since I think it was actually trying to do something a bit more serious and deep. However, I can't lie... it didn't really succeed in that endeavor.
Howard, Raj, and Bernadette are facing a dilemma: the floor in baby Halley's room is squeaky. They spend the episode trying to find a route through the room without squeaking. That's... it. Why is Raj even in this show anymore? I used to really love his character, and now he's beyond useless. And I thought that our first episode with Bernadette as a mother was surprisingly nuanced, while this episode completely sidelined her so that her husband and her husband's boyfriend could participate in some mediocre physical comedy.
Then you've got the main story: Penny is upset because Leonard never has time for her anymore, so they get into a fight about the state of their relationship. Penny goes off on a spa weekend with Amy, and Leonard later follows her, with Sheldon in tow. They realize they have some stuff to work on, and ask Sheldon to help them make a Relationship Agreement.