This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Assessment of Growth, Subject name: Pediatrics
What is average birth weight at 2 years? 
Select and explain. 
A. Double of birth weight, B. Thrice birth weight, C. Four times of birth weight, D. Six times birth weight
C: Four times of birth weight
Answer: C: Four times of birth weight 
Explanation: Ans. is 'c' i.e., Four times of birth weight AgeWeightBirth3 Kg5 months6 Kg (2 x birth weight)I year9 Kg (3 x birth weight)2 years12 kg (4 x birth weight)3 years15 kg (5 x birth weight)5 years18 kg (6 x birth weight)7 years21 kg (7 x birth weight)10 years30 kg (10 x birth weight)