Here is a cute article from a Hawaii newspaper about 16 of the babies that played "Aaron" over the course of last season of Lost.
All of the Aarons met in the park for a picnic and interestingly, 13 of them were girls! The casting director explained that, "Females tend to have the rounder face and they don't age as quickly."
Read the full article:
The article also mentions for any babies with acting aspirations:
Lost is looking for 10- to 17-pound babies with blond hair and blue or green eyes for the show's fifth season. If your child fits that description, send a photo and phone number to: Julie Carlson, "Lost" cast, 510 18th Ave., Honolulu, HI 96816