Pediatrics Growth a0932ec3 Bih length doubles by what age? A 1 year B 2 years C 3 years D 4 years High-Yield Explanation Bih length doubles by 4- 4 1/2 yrs of age Age Bih 1 year 2 year 4 year 12 year Height 50 cm 75 cm 90 cm 100 cm 150 cm Length of child increases by 50% in 1st year.