Each girl has their birthday coming up consecutively (in order - Amy, Bella, Emily, Chloe and Daisy), and they all decide that a sleepover party would be a good idea.
At Amy's girly sleepover they enjoy lots of dancing, singing, painting their nails together and having a midnight feast.
They then watch very scary horror movies which causes Daisy to stay awake all night in fear.
When they get upstairs, Lily, who is awake, wails loudly upon hearing them and scares Chloe, causing her to wet herself and she decides to return home that night.
Emily, Amy and Bella stand up for Daisy and Lily and claim that Chloe is the baby (a reference to the wetting incident).