A must have for Early Intervention and play-based assessments, but can also be used for any discipline that needs to calculate a child's chronological age for testing purposes.Calculate the age of a child in years, months and determine the percent delay. Very easy to use....just enter your information into the green boxes and everything is calculated automatically.To calculate the age of the child, enter the date of birth and your testing date. To calculate the percent delay, enter the child's a