Dawn, the newest member of the Baby-sitters Club, gets more than she bargained for when her first job turns into a disaster and she has problems with Kristy.
When Kristy Thomas' mother decides to get married again, Kristy and her friends in the Baby-sitters Club have to cope with all the small children that her family and friends are bringing to the wedding.
Attracted to shy Mary Anne, Logan asks to become a member of the Baby-Sitters Club and gets Mary Anne as his "checker" on his trial job, but Mary Anne is plagued by a series of embarassing episodes.
Accompanying the Pike family during a two-week vacation to the Jersey Shore, baby-sitter Stacey falls head over heels for a handsome lifeguard despite Mary Anne's warning that he is too old for her.