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: Social & Preventive Medicine
Neonatal period is - 
Select and explain. 
A. Upto 1 year of life, B. Upto 28 days of life, C. 28 days to 1 year of life, D. First 7 days of life
B: Upto 28 days of life
Answer: B: Upto 28 days of life 
Explanation: Ans. is 'b' i.e., Upto 28 days of life Childhood o Infancy upto 1 year A) Neonatal --> First 28 days of life a) Early neonatal -9 First 7 days of life b) Late neonatal -4 7 days of 28 days of life B) Post neonatal --> 28 days to 1 year o Pre-school 1-4 years o School age --> 5-14 years Perinatal period --) Period from 28th week of gestation to the seventh day after bih.