This is book number 2 in the The Baby-Sitters Club Graphix series.
Poor Stacey. She just moved to a new town, is still coming to terms with her diabetes, and is facing baby-sitting problems left and right. Fortunately, Stacey has three new friends -- Kristy, Claudia, and Mary Anne. Together they're the BSC -- and they will deal with whatever's thrown their way... even if it's a rival baby-sitting club!