In 1963, when Hanna-Barbera decided to add a baby to the Flintstones, their first choice was a boy. When Ideal Toy Company heard this, company executives approached Hanna-Barbera with a proposal to change the baby character to a girl for which the toymaker could create a doll, and Hanna-Barbera agreed. According to the February 22, 1963, edition of TV Guide, Pebbles was born at the Bedrock Rockapedic Hospital on February 22, 10,000 B.C. That particular year was never actually cited within the show itself; most versions of the show put the Flintstones' era as circa 1,000,000 B.C.
As an infant, Pebbles quickly became lifelong best friends with her next-door neighbor, Bamm-Bamm Rubble.
By the time she was a teenager, Pebbles was noted for getting Bamm-Bamm and their friends into various misadventures, mostly due to sharing her dad's penchant for schemes that would inevitably backfire (such as causing a strike by Bedrock's city employees when she was elected honorary mayor for a week). She and her friends attended Bedrock high School; Pebbles had a catchphrase similar to her father's: "Yabba-Dabba-Doozie!"[8
As an adult, Pebbles pursued a career in advertising and married Bamm-Bamm. After this, the newly married couple moved to Hollyrock, a fictional, prehistoric version of Hollywood, California. They eventually had a son named Chip and a daughter named Roxy, who were fraternal twins.