Ann M. Martin Facts: 15 Things You Didn't Know About The Baby-Sitters Club Author

Kristy's Great Idea wasn't Ann M. Martin's idea. The book that launched a 213-novel, 176-million-copy publishing phenomenon started as a Scholastic editor's hunch about a completely different, forgettable book — and Martin was handed nothing but a title and "a glimmer of an idea." Everything else, she built from her own childhood.

👉 Prefer to listen? We cover all of this (and more!) in our full Kristy's Great Idea podcast episode.

What is Kristy's Great Idea?

Kristy's Great Idea is the 1986 novel that launched The Baby-Sitters Club — one of the best-selling children's series ever published. When Kristy Thomas's mum can't find a sitter for her younger brother one afternoon, Kristy has a lightbulb moment: what if she and her friends ran a babysitting business together, and parents could reach all of them with a single phone call? By the end of the book, Kristy, Mary Anne, Claudia, and new girl Stacey have formed the club — and set in motion more than 200 sequels and spin-offs, an HBO series, two further screen adaptations, and tens of millions of readers.

Ann M. Martin: The Woman Behind Kristy

Ann Matthews Martin was born in Princeton, New Jersey, in 1955, the daughter of a New Yorker cartoonist and a preschool teacher. She studied early-childhood education and child psychology at Smith College, then taught a split fourth-and-fifth-grade class in Connecticut — several of her students had learning disabilities, including dyslexia and autism, an experience that shaped how the series later handled kids being cared for by the club. She left teaching to become a children's book editor at Scholastic, and it was after she'd moved on from there to freelance writing that a former colleague came calling with an idea.

15 Ann M. Martin & Baby-Sitters Club Facts You Didn't Know

1. She didn't invent the Baby-Sitters Club — an editor did

Scholastic editor Jean Feiwel noticed an obscure book called Ginny's Babysitting Job kept quietly outselling everything else in the catalogue, despite "a rotten cover." She approached Martin — a former colleague — with just the concept and the title. Martin invented the characters, Stoneybrook, and every plot herself.

2. It was only meant to be four books

The original plan was a four-book miniseries with initial print runs of 30,000 copies each. Kristy's Great Idea sold out immediately and moved another 120,000 copies — Scholastic asked for more almost right away, and it never really stopped.

3. Kristy is based on Martin's real childhood best friend

Kristy Thomas is modelled on Beth McKeever Perkins. The two really did start short-lived clubs together as kids — Martin has said they'd meet, eat cookies, and the club would fizzle out within a couple of days.

4. Mary Anne is Martin's own self-insert

"I'm much more like Mary Anne," Martin has said. "Kristy is my polar opposite" — which is exactly why Kristy became her favourite character to write.

5. Claudia was named after a real friend

Claudia Werner, a friend of Martin's, lent her name to the club's resident artist. Claudia's wildly specific outfits — feather belts, palm-tree knee socks, skeleton earrings — were pulled from real clothing catalogues and magazines, not invented from scratch.

6. Stacey's diabetes came from real life — twice

Martin gave Stacey diabetes after two of her own childhood friends were diagnosed with the condition. Years later, when Martin's own cat developed diabetes, the research she'd done for the books actually helped her manage it.

7. Every character's "unique" handwriting was faked by one person

Each book's handwritten diary passages — Kristy's no-frills scrawl, Stacey's heart-dotted i's — were all created by a single staffer in Scholastic's art department, not written to reflect each character's real penmanship.

8. Martin wrote the first ~35 books herself, longhand, one a month

Ann M. Martin worked 8am to 6pm daily on yellow legal pads. By the mid-90s, juggling spin-offs, she told the Washington Post she was responsible for "over 30 books a year… I don't even think Stephen King could do it."

9. Ghostwriters took over — but Martin still ran the show

Writers including Peter Lerangis, Ellen Miles, and Nola Thacker eventually took on the workload. Martin still outlined every plot herself and edited each manuscript before it went out.

10. There was a "BSC bible" — overseen by a 19-year-old intern

To keep 200+ ghostwritten books consistent, Scholastic built a reference bible tracking every character's eye colour, hobbies, and habits. It was overseen by intern David Levithan, who later became Scholastic's editorial director. He told The Atlantic he read BSC "with a highlighter to keep track of who spoke French, who had green eyes."

11. Kirsten Dunst's first modelling job is hiding on book #2

Dunst confirmed to Parade in 2008 that her very first modelling gig was posing as the toddler Claudia holds on the cover of Claudia and the Phantom Phone Calls — Baby-Sitters Club book #2.

12. The covers were full oil paintings, not illustrations

Artist Hodges Soileau painted at least 131 of the original series' covers by hand (he painted over 300 book covers across his whole career, including The Boxcar Children and Harlequin romance novels). Original cover paintings have started turning up at auction.

13. Fans revolted when Stacey was written out

In book #13, Good-bye Stacey, Good-bye, Stacey moves back to New York. "BIG MISTAKE!" Martin later wrote on her own Facebook page, recalling the backlash — Stacey got her homecoming in book #28.

14. Author John Green is a genuine, vocal BSC fan

Green has written about falling for the series as a kid, adding: "If I may paraphrase Faulkner when talking about the Baby-sitters Club: for me, at least, Stacey's griefs grieved on universal bones."

15. The girls never age — on purpose

Despite spanning years of in-story Christmases and summer vacations, the characters stay locked at 12–13 throughout. It was a deliberate choice so new readers could jump in at any point without needing backstory.

Baby-Sitters Club Adaptations — Fast Facts

Adaptation	Year	Notes
VHS specials	Early 1990s	Scholastic self-produced two specials after networks doubted a girl-led show could work — they sold roughly 1 million copies at $12.95 each.
HBO series	1991	13 half-hour episodes, later rerun on the Disney Channel.
Feature film	1995	Schuyler Fisk (Sissy Spacek's daughter) as Kristy, Rachael Leigh Cook (her film debut) as Mary Anne, Larisa Oleynik as Dawn, Bre Blair as Stacey.
Netflix series	2020–2021	Modernised, more diverse casting. Both seasons scored 100% on Rotten Tomatoes — Netflix cancelled it after 2 seasons in 2022 anyway, citing low viewership.

FAQ

What are the best facts about Ann M. Martin?

The most surprising: she didn't come up with The Baby-Sitters Club at all — a Scholastic editor did — and Kristy is based on her real childhood best friend, while Mary Anne is Martin's own self-insert.

Who was Kristy's Great Idea based on?

Kristy Thomas is based on Ann M. Martin's childhood best friend, Beth McKeever Perkins. The two really did start short-lived clubs together growing up — just nothing as organised as the Baby-Sitters Club.

How many Baby-Sitters Club books are there?

The original numbered series ran to 213 novels by 2000, plus spin-offs like Baby-Sitters Little Sisters and California Diaries — more than 200 books in total, selling an estimated 176 million copies.

Is The Baby-Sitters Club based on a true story?

Not directly, but several elements come from real life: Kristy and Mary Anne are based on Martin and her real best friend, Claudia is named after a real friend, and Stacey's diabetes was inspired by two friends who had the condition.

Why did Ann M. Martin give Stacey diabetes?

Two of Martin's childhood friends had diabetes, and she wanted one of the girls to have a medical condition. She's said she didn't expect the book to help readers recognise their own symptoms — but many did.

TL;DR

Kristy's Great Idea might be the most accidental empire in children's publishing — a Scholastic editor's hunch, a favour to a former colleague, and four made-up 12-year-olds turned into 213 books, four screen adaptations, and an estimated 176 million copies sold. Nearly 40 years later, it's still one of the most-searched book series of its generation.

👉 Get the full story — listen to our Kristy's Great Idea podcast episode.