Pip and Posy: The Super Scooter (9780857630797) by

Pip and Posy are typical toddlers: they're best friends and have fun but sometimes they get cross and sad, so it takes friendship, sharing and understanding to make things better. In this book, Posy snatches Pip's scooter and tries to ride it but she falls off and hurts her knee. Though Pip is very cross, he comes running to help.