The growth and development of children will always be the main thing for every parent. Various obstacles in the process of child development still occur. What is more fatal is when parents do not realize or do not know about the mismatch of developmental tasks for children aged 3 to 5 years. If left unchecked, this error will affect future developments. To solve this problem, we created a program called "Hello Smart Baby" in the form of a website that aims to detect the level of developmental appropriateness of children aged 3 to 5 years. This research method uses qualitative methods with as many as 20 research subjects. From the test results of the Hallo Smart Baby website on parents of children aged 3 to 5 years, which was carried out using a random sampling technique, it shows results that are relevant, specific and can have a positive influence on parents in terms of paying attention to their child's growth and development. This proves that the quality of human resources in Indonesia is greatly affected by the supporting facilities, facilities and infrastructure

Smart Baby, Application, Child Development