Keywords: Biparietal diameter by gestational age.png Biparietal diameter of a fetus by gestational age with blue line representing the mean and the green area representing the 90 prediction interval Reference Cite journal Snijders RJ Nicolaides KH Fetal biometry at 14-40 weeks' gestation Ultrasound Obstet Gynecol 4 1 34-48 Jan 1994 10 1046/j 1469-0705 1994 04010034 x 12797224 In addition to data taken from this study the diagram is extrapolated from 0 to 14 weeks of gestational age by the rationale that it is 0 by fertilization at 2 weeks of gestational age own Mikael Häggström gallery of 2014 2013-09-13 File Biparietal diameter by gestational age svg Obstetric ultrasonography Cc-zero |