Nikki's best friends want to throw her a birthday part with cake, special invitations, and even a DJ. But when her mom claims the party is too expensive, Nikki thinks her birthday might be a bust.

After celebrating their first nine same-day birthdays together, Amanda and Leo, having fallen out on their tenth and not speaking to each other for the last year, prepare to celebrate their eleventh birthday separately but peculiar things begin to happen as the day of their birthday begins to repeat itself over and over again.

Get ready to party! It's Bad Kitty's birthday, and guess who's on the guest list? Chatty Kitty, Strange Kitty, Stinky Kitty, and her other neighborhood "pals". join the fun in this riotous companion to Bad Kitty and Bad Kitty Gets a Bath!

Eva is planning a big sleepover for her "hatchday" celebration, but one of her friends, Sue, does not seem to want to attend--so Eva must find out what is bothering Sue, and help her get over her first-sleepover jitters.

It's bad enough Ian Barker has to spend his twelfth birthday with his sister and their two annoying cousins. The four of them can't ever hang out without getting into trouble. Vinnie and Jonny always want to play with Ian's stuff. They take extra turns and break everything they touch. Even Ian's new birthday presents are up for grabs. But when Ian gets a Slappy dummy from his dad, things go from bad to worse.

Nancy is furious when she cannot go to her friend Bree's butterfly-themed birthday party, but her family's outing might just be extraordinary enough to make her feel better. Includes facts about butterflies.

As spring arrives on Gardam Street, there are surprises in store for each Penderwick, from neighbor Nick Geiger's expected return from the war to Batty's new dog-walking business, but her plans to use her profits to surprise her family on her eleventh birthday go astray.

Despite the objections of Pig and Mouse, Duck insists on adding a special ingredient to the cake they are making to celebrate Cow's birthday.

After her twelfth birthday, Rory checks off a list of things she is finally allowed to do, but unexpected consequences interfere with her involvement in the movie being shot at her school, while a weird prediction starts to make sense.

When Mr. Putter and Tabby take Mrs. Teaberry to the Conservatory for her birthday, Zeke tries his best to stay out of trouble, but one of the trees is irresistible.