The main feature of this application is a child height prediction calculator based on several important parameters input by the user:

Child Age: Users can select the child's age in the range of 4.5 to 17 years with an interval of 0.5 years.
Child's Gender: User can select the child's gender, either "Boy" or "Girl".
Child's Height (cm): Users can input the child's height in cm.
Child's Weight (kg): Users can input the child's weight in kg.
Mother's Height (cm): Users can input the mother's height in cm.
Father's Height (cm): Users can input the father's height in cm.

Height Prediction Results
Based on data entered by the user, this application will calculate and provide predicted results for the child's height. Calculations are made using the average height of the parents. The prediction results will be displayed in the form of a pop-up dialog with information about the predicted height in cm.