This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Growth and Development, Subject name: Social & Preventive Medicine
Height of a newborn doubles at 
Select and explain. 
A. 2 months, B. 5 months, C. 1 year, D. 4 years
D: 4 years
Answer: D: 4 years 
Explanation: Height of a newborn doubles at the age of: 4-4 1/2 years Height increase pattern in children: Age Height increments 1st year 25 cms per year 2nd year 12 cms per year 3rd year 9 cms per year 4th year 7 cms per year 5th year 6 cms per year