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ACOG advises newborns whose birth weight is less than the 10th percentile for gestational age are considered small for gestational age (SGA) . Whereas a fetus with a weight that is less than the 10th percentile for its gestational age is considered to have fetal growth restriction (FGR), also known as intrauterine growth restriction (IUGR) [5, 7]. Monochorionic twins growth rate growth begins to slow at 28 weeks and averages about 170 grams per week thereafter until 37 weeks [45] After obtaining a reliable gestational age and best estimate of the fetal weight, a growth chart or weight table may be used to assign an EFW growth percentile . Singleton, Twin, and Preemie Growth Charts (click images to enlarge) BACK TO TOP OF PAGE The Royal College of Obstetricians and Gynaecologists (RCOG) recommends that a fetal abdominal circumference (AC) or estimated fetal weight (EFW) less than 10th centile can be used to diagnose a small for gestational age (SGA) fetus. A classification system for selective intrauterine growth restriction in monochorionic pregnancies according to umbilical artery Doppler flow in the smaller twin.

The mother's bladder should be empty when the measurement is done. Select the parameters and corresponding measured values to use, then press the 'Calculate' button The average singleton fetus weighs about 80 grams (2.8 ounces) by the end of the first trimester and grows increasingly faster after 22 weeks to reach a maximum growth rate of almost 220 grams (7.8 ounces) per week by 35 weeks '. Growth then slows down and is about 185 grams (6.5 ounces) per week by 40 weeks [17]. The distance from the top of the pubic bone (symphysis pubis) to the top of the pregnant uterus (fundus) is measured in centimeters (cm). The SFH in centimeters should be equal to the gestational age in weeks. In addition the accuracy of the sonographic estimate decreases with increasing birth weight [26,27] , and tends to be overestimated in pregnancies suspected of being large for gestational age (LGA) and underestimated in pregnancies with preterm premature rupture of membranes (PPROM) and suspected fetal growth restriction (FGR) [10].