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
[{'content': 'Birth weight of newborn baby doubles by? \nSelect and explain. \nA. 4 months, B. 5 months, C. 6 months, D. 7 months', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Birth weight doubles by 5 months, tripless by 1 year, quadraples by 2 years.', 'role': 'assistant'}]