Formula to related doses for children to their age as per Young's rule is given by
1
\(\rm \frac{Age \ in\ years}{Age\ in\ years\ +20}\) = proportion of adult dose
2
\(\rm \frac{Age \ in\ years}{20}\) = proportion of adult dose
3
\(\rm \frac{Age \ in\ years}{12}\) = proportion of adult dose
4
\(\rm \frac{Age \ in\ years}{Age\ in\ years\ +12}\) = proportion of adult dose