If his measurements read the expected 25.8 inches on his birthday, he will officially be named the world's shortest man.
Once his measurements are taken three times in the span of 10 hours he is expected to overtake Edward Nino Hernandez of Colombia, who measures a relatively towering 27 inches.
Thapa weighs just over 12 pounds, and his parents say he acts like a young child. His family and local doctors don't know why he never grew .
His younger brother is a normal height for a boy of 13.
The Associated Press contributed to this report.