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
Infant body weight is tripled by age of – 
Select and explain. 
A. 5 months, B. 11 months, C. 2 years, D. 18 months
B: 11 months
Answer: B: 11 months 
Explanation: The average birth weight of neonates is about 3 Kg.
During first few days after birth, the newborn loses extracellular fluid equivalent to about 10% of the body weight.
Most full term infants regain their birth weight by the age of 10 days.
Subsequently, they gain weight at a rate of approximately 25 to 30 gm per day for the first 3 months of life.
Thereafter they gain about 400 gm of weight every month for the remaining part of first year.