Which episode is the male obstetrician secretly eating oxytocin?

The first episode. In order to catch up with auspicious days, pregnant women took oxytocin drugs, which even experienced old doctors like Zuo Shengde found difficult, but they inadvertently learned from their husbands that pregnant women were very obsessed with mahjong, so they decided to create an environment surrounded by mahjong, so that pregnant women could wake up for surgery and give birth smoothly.