Fetus Weight Chart. By 40 weeks, the average baby weighs 3.5kg (7.6lb), and is about 51.2cm (20.2in) long from. This estimated fetal weight calculator will calculate percentiles as well as the estimated fetal weights based ultrasound data and on many published formulas.* calculations are based on the 4 common fetal measurements, biparietal diameter (bpd), head circumference (hc), femur length (fl), and abdominal circumference (ac).
Average fetal length and weight chart. A fetal growth chart is basically just a chart that tracks the approximate growth of average babies from week to week during your pregnancy. The fetal development chart below will tell you the length and weight of an average baby from eight weeks of pregnancy, through to birth.