Bumface by Morris Gleitzman

Angus dreams of being bold, brave, wild and free, like Bumface the pirate in the stories he tells his younger siblings. Instead he's his mum's Mr Dependable, always looking after the younger ones and cleaning up. He's desperate to stop his mum adding another baby to the family so comes up with a plan to prevent her getting pregnant. With a bit of help from his new friend, Rindi, he might just do it . . .
Binding: Paperback / softback