LORELAI: So it’s a girl?
SHERRY: Yeah. Christopher would’ve been happy with either, but I really wanted a ballerina.
Apparently Sherry thinks any girl is automatically a “ballerina” – perhaps a reflection on Amy Sherman-Palladino’s upbringing by a ballet teacher. Of course, not every girl wants to be a ballerina, and plenty of boys enjoy ballet.
It’s notable that Lorelai also enrolled Rory in ballet classes when she was a little girl, so her views and Sherry’s are not that different here.
The Annotated Gilmore Girls 