This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: New born infants, Subject name: Pediatrics
The newborn period is defined as the first ________ days after bih 
Select and explain. 
A. 21, B. 28, C. 30, D. 40
B: 28
Answer: B: 28 
Explanation: The neonatal period is defined as the first 28 days after bih and can be fuher subdivided into Very early: Bih to 24 hours Early: Bih to 7 days Late: 8 days to 28 days Ref: Nelson textbook of pediatrics 21st edition Pgno: 863