This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
Height of a newborn doubles at:September 2005, March 2010 
Select and explain. 
A. 1 year, B. 2 year, C. 3 year, D. 4 year
D: 4 year
Answer: D: 4 year 
Explanation: Ans. D: 4 yearIn general, length in normal term infants increases about 30% by 5 months and > 50% by 12 months; infants grow 25 cm during the 1st yr; and height at 4 yr is about double bih length.