<prompt> Which is not true about Downs syndromeDecreased humerus length.Decreased nuchal fold thickness.Decreased femur length.Duodenal atresia.  <response>: Ans. is b i.e. decreased nuchal fold thickness Nuchal fold thickness is increased in Downs syndrome not decreased. Infact this feature is used in suspecting the diagnosis of Downs syndrome prenatally.Nuchal fold thickness is assessed prenatally by ultrasound.Other characteristic feature of Downs SyndromeIt is the commonest chromosomal disorderSignificant hypotonia.Oblique palpebral fissure.Clinodactyly .CHDs ASD, PDA, A-V communis.Brushfield Spots white spots on Iris.Intestinal atresia.Varying degree of growth and mental retardation.Flat face.High arched palate.Reduced length of femur and humerus on ultrasound. 