Underbara Unge is a mobile application that enables parents to create a "Mitt första år" book for their child's first year, documenting every important moment, milestone, and memory. The app is the first of its kind, allowing users to upload photos and add details such as weight, length, and family tree. The app also features a section for the child's birth story, and users can choose to create their own titles or use the suggested ones.

Parents can create multiple books at once, and the app sends notifications for users to document every moment. The app is also useful for parents with children older than one year, as they can create the book retrospectively. Users can choose to fill in all text blocks or only the ones they want to use. The book is printed in Sweden with high-quality materials, including a hardcover, silk-coated paper, and PUR binding.

The app is available for free on Android, and the book can be purchased for 499 kr. Users can contact for any inquiries.