Calculating the weight of the baby in the womb can be done by ultrasound estimation method, palpation estimation method, and so on. Ultrasound estimation method refers to the estimation through the data obtained in the ultrasound examination. The formula is Fetal Weight (grams) = 1.07*BDP (cm)*BDP (cm)*BDP (cm) + 0.3*AC (cm)*AC (cm)*FL (cm). Where BDP refers to Biparietal Diameter, AC refers to Abdominal Circumference and FL refers to Femoral Length. Palpation estimation method is to use the uterine height and abdominal circumference to estimate the baby’s weight, which is relatively simple and easy to use, with the formula of Fetal Weight (g) = Uterine Height (cm) *Abdominal Circumference (cm) + 200. This method is less accurate, but is convenient and quick to use, and can be used as a reference as well. It is recommended to have professional measurements taken by your doctor to determine your baby’s growth when you undergo a maternity checkup.