<prompt> Upper segment to lower segment ratio in 3 yr age child is -121.31.41.6  <response>: Ans. is b i.e., 1.3 o The lower segment extends from the symphysis pubis to the heels. o The lower segment grows rapidly after bih as compared to upper segment giving rise to the gradual reduction in the upper segmentlower segment ratio with the progression of age. Age Upper segment : Lower segment ratio At bih 1.7 : 1.0 3 years 1.3 -1.0 At 7 years 1.0 : 1.0 Thereafter 1.0:1.1 