The six-year-old boy, whose name has not been released, has 16 toes and 15 fingers. Hey with a few more toes and fingers and he likely would be able to get by without a calculator for most of his life.
One of the fingers is incomplete and appears on X-ray photographs as a "fork" sticking out from the right thumb.
Three fingers on each of the boy's hands are also fused together by skin.
The boy, from Shenyang in China's north-eastern Liaoning province, beats the current world record held Indian boys Pranamya Menaria and Devendra Harne, who have 12 fingers and 13 toes.
Fro those interested this condition is known as polydactyly.