Ad from BSC book #43
Ad from Little Sister #19
The Little Sister Birthday Club was a Scholastic club fans could join in 1992 when the Baby-Sitters Little Sister books were being published. On her birthday, the club member would receive a personalized card from Karen. Every month, a BIRTHDAY KID OF THE MONTH would be randomly chosen to win a complete set of Baby-sitters Little Sister books, with the first book in the set autographed by Ann M. Martin. The offer expired March 31, 1992.