Breathing movement of fetus on USG is first detected on?: (A) 11 weeks, (B) 20 weeks, (C) 24 weeks, (D) 26 weeks
Answer is A. Ans. A. 11 weeksDutta states: "Breathing movements are identified by 11 weeks but are irregular until 20th week. Their frequency varies from 30-70 per minute and is dependent on the maternal blood sugar concentration."