Babies Ruin Everything by Matthew Swanson
When her parents bring home her baby brother, this new big sister is not pleased. She is convinced they need a better baby, one who can actually build yarn forts, throw a Frisbee, and play zombie attack. But when she opens her heart, she realises she can be a better sibling and how fun that can be. Perfect for a funny and stubborn child who's about to become a brother or sister, Babies Ruin Everything addresses the angst a child can feel with delightful humour the whole family can enjoy.