Hello Baby is a lifestyle application designed for iPhone users. It provides a countdown to the expected delivery date and tracks the number of weeks that have passed since pregnancy. The app features a visual representation of the baby, which grows larger as the weeks progress.

Users can interact with the app by observing the baby floating inside a bubble surrounded by light. Touching the screen allows the baby and bubble to move, adding an interactive element to the experience. The countdown of days and weeks updates automatically, but users also have the option to manually adjust the display by interacting with the screen.