![]() If you're 26 weeks pregnant, for example, your fundal height should be about 26 cm, give or take a centimeter in each direction. Beginning at about 24 weeks, the measurement in centimeters should roughly match the gestational age of your baby. Using a tape measure stretched over your belly, your provider will use a fundal height measurement to check your baby's size at your prenatal visits. In the last few weeks of pregnancy, the growth rate continues to gradually slow to about 168 grams (a little less than 6 ounces) per week by week 40.(Twins slow earlier, at around 28 weeks, and then average about 170 grams each week.) After 35 weeks, growth slows to about 188 grams per week, or 6.6 ounces.At 35 weeks, a fetus is gaining about 215 grams each week, or about 7.5 ounces.By 30 weeks, a fetus is gaining about 175 grams each week (more than 6 ounces).By 20 weeks, a fetus is gaining about 59 grams per week (just over 2 ounces).Up until 16 weeks, a fetus grows an average of about 19 grams per week, gradually increasing from 7 grams per week at 8 weeks to 15 grams per week at 12 weeks and 29 grams per week at 16 weeks.Here are some highlights, based on estimations: If you're having one baby (not twins or multiples), your baby's rate of growth accelerates until 35 weeks, then decelerates. Your baby steadily gains weight over the course of your pregnancy, but it's not always at the same rate. Mark Curran, maternal-fetal medicine specialist, for his help preparing this chart. ![]() And remember, the height measurements up to 13 weeks are head-to-bottom estimates, while the height measurements starting at week 14 are head-to-toe estimates. For the numbers on our chart, we've taken an average of boys and girls. ![]() That's okay – after all, healthy babies can weigh less than 5 pounds or more than 9 pounds at birth.īoy's measurements are different than girl's measurements, even this early. Keep in mind that your baby may be much smaller or larger than these averages. Wondering how big your baby is during each week of pregnancy? The numbers in our chart below can give you a sense of your baby's size. Your provider may make adjustments based on your individual circumstances. Note that the data used by Hadlock was gathered from middle-class Caucasian women with no history of maternal diseases known to affect fetal growth and no evidence of congenital anomalies. ![]() (Providers don't measure height after 13 weeks, however, so don't expect to get those numbers at your ultrasound appointments.) The numbers on our chart should coincide with the numbers your healthcare provider will be checking against when they measure your baby using ultrasound. The American College of Obstetrics and Gynecology (ACOG) and the Society for Maternal and Fetal Medicine (SMFM) use Hadlock's figures to diagnose and manage fetal growth conditions, such as intrauterine growth restriction (IUGR). Hadlock, the main source we use in our fetal growth chart, provides one of the most commonly used – and most accurate – equations for estimating fetal height and weight. After the first 13 weeks, the measurement is taken from the top of the head to the baby's heel – explaining why, on the chart below, your baby appears to grow 3 inches from week 13 to week 14! For the first 13 weeks, the height measurement is taken from the top of the head to the baby's bottom. Height is a straightforward measurement, but the method of measuring it changes after the first trimester. ![]()
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