Work out milestone age checker instantly with clear inputs, formula shown and shareable results.
The child's age is compared with the typical milestone age and the usual range around it, so the result is the number of months early or late and whether that falls inside the window. Milestones are ranges rather than deadlines, and stating the window explicitly avoids reading a normal two-month lag as a problem.
Gap
gap = child's age - typical milestone age, in months
Usual window
window = typical age plus or minus the usual range
gap = child's age - typical milestone age, in months. The child's age is compared with the typical milestone age and the usual range around it, so the result is the number of months early or late and whether that falls inside the window.
Milestones are ranges rather than deadlines, and stating the window explicitly avoids reading a normal two-month lag as a problem.
Enter child's age, typical age for the milestone, usual range around that age. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.