Doogie Howser, M.D. (1989)

S3E17 If This Is Adulthood, I'd Rather Be in Philadelphia

After several months of seeing Cecilia, Doogie uncovers her secret: she has a 4-year-old son. This revelation awakens Doogie's nurturing side, forcing him to confront his feelings about fatherhood and what it means for their relationship.