Anatomy Abnormal labor 7e78821d In pregnant women of 28 weeks gestation IUD is earliest demonstrated on X-ray by: A Increased flexion B Overlapping of cranial bone C Spalding's sign D Gas in vessels High-Yield Explanation Gas in the great vessels of fetus is called as Robes sign It occurs 12 hrs interval after death. Ref: Datta Obs 9e pg 303.