This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Child rolls over by 
Select and explain. 
A. 3 months, B. 6 months, C. 7 months, D. 8 months
B: 6 months
Answer: B: 6 months 
Explanation: Once the assymetric tonic reflex disappears, baby learns to roll over from prone to supine and vice versa. Between 4 to 6 months, baby learns to roll over from back to side and then from back to stomach. Ref: Ghai, 9 th edition, page- 42.