The Baby Sitters Agency only existed in Book #3 The Truth About Stacey . The BSA was made up of older girls who could stay out later than the members of the Baby-Sitters Club. However, the girls the BSA used were irresponsible. One let Jamie Newton play outside in the street by himself and another left a cigarette burn on a client's furniture. The club gave the BSC some competition at first but folded rather quickly.