Ricky Has Labor Pains - S2-E19
Trivia: After Lucy's baby shower, one of the gifts she received is a baby doll in a box lying on the couch, that Ricky picks up and smiles at. The actor has a reason to smile, as this doll is the "I Love Lucy Baby" doll which came in a box that had a small drawer with accessories, and was sold in stores. (00:09:30)