Seeing Double
While Erin Murphy is known as Tabitha from Bewitched, like most sitcoms, twin girls were cast as the daughter of the main characters. Erin’s sister, Diane, also portrayed the young Tabitha. However, as the two girls grew, they started looking less alike. Therefore, Erin mostly assumed the role as Diane slowly stopped appearing on the show.
It was and still is extremely common to cast twins or even triplets as the baby on a TV show. That’s because children can’t work too many hours on end that might be necessary for filming, so duplicates are used for continuity’s sake. However, we never really think of what happens when the two stop looking all that alike.