Bewitched S01E12 - And Something Makes Three

Bewitched (1964)
S01E12 And Something Makes Three
Episode Overview
Larry spots Louise and Samantha heading into an obstetrician's office and mistakenly believes Darrin is soon to be a father. In reality, it's Louise who is expecting, but she's too nervous to share the news with Larry. After Larry informs Darrin, Darrin imagines a whimsical scenario where Samantha gives birth to magical "witch" children. During a dinner later that evening, the real situation unfolds, revealing the truth about the pregnancy.