Building cubbies, make-believe, dressing up - while it might just look like fun and games, play is actually crucial for your child's development. The problem is, as Australian kids spend more time at school, on their screens and in structured activities, they're not playing enough. Maggie Dent talks with expert Robyn Monro Miller about why kids of all ages need to play more. Plus, Bluey creator Joe Brumm chats about why play is the key to the success of Australia's most loved family of cartoon dogs.