Hellobaby is a free Android app developed by Hellobaby that provides professional advice on child development for parents and caregivers. With Hellobaby, parents can input their child's birth date, height, weight, and other essential information to receive personalized recommendations for their child's growth.

The app offers five categories of child development, including language, cognition, movement, emotion, and social skills. Each category is subdivided into multiple subcategories, such as vocabulary, memory, gross motor skills, fine motor skills, empathy, and communication, among others. Hellobaby also provides a comprehensive guide to vaccinations, nutrition, and common illnesses, as well as a directory of nearby health clinics and hospitals.

Moreover, Hellobaby has a "1000-day journey" feature that provides daily tips and advice on child development for the first 1000 days of a child's life. The app also includes a section for parents to record their child's health data, such as height, weight, and vaccination records. Overall, Hellobaby is an excellent app for parents who want to stay informed about their child's development and ensure that they receive the best care possible.