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
Non-appearance of social smile even after ..... weeks, is considered as abnormal: September 2011 
Select and explain. 
A. 2 weeks, B. 4 weeks, C. 6 weeks, D. 8 weeks
D: 8 weeks
Answer: D: 8 weeks 
Explanation: Ans. D: 8 weeks Child stas smiling back (social smile) when anyone talks to him or smiles at him by 6-8 weeks of age Impoant milestones: Head control: 1 month Sits with suppo: 5 months Transfer object from one hand to other: 6 months Crawls at: 8 months Says mama dada: 10 months Babies know his/ her gender: 3 years Can draw a circle: 3 years Self decisions: 7 years