First appearance of Tabitha, as well as the first appearance of Cousin Serena, who would be a recurring character for the remainder of the series.
Elizabeth Montgomery returned from her three-month maternity break to resume production on this episode.
The birth of Tabatha created one of the rare occasions where Endora (Agnes Moorehead) is nice to Darrin (Dick York) and they share a tender moment together.
The nurse is played by actress Eve Arden, who, a decade earlier, had a hit TV series of her own called Our Miss Brooks (1952), in which she played a wisecracking high school teacher.