How Much Should a Fetus Weigh at 30 Weeks?


A Fetus Weighs About 3 Pounds at 30 Weeks

  • At 30 weeks of gestation, the fetus's appearance approaches the one of a newborn with hands and feet fully formed. The fetus averages 2.91 pounds, according to the average fetal length and weight chart on the Baby Center website.

Weight Varies By Gender and Race

  • Clinical studies have shown that these average weights may be a half-pound off, depending on the fetus’s gender and race. Having twins, triplets or more changes the estimates. The mother also may not know accurately when she became pregnant. This may introduce some inaccuracy into the weight because the fetus gains a half-pound per week at this stage of pregnancy.

Bottom Line

  • Your physician can best assess with a sonogram whether the development of the fetus at 30 weeks follows normal patterns. Protecting the fetus to full gestation matters more than estimating fetus weight as healthy full-term babies can weigh from less than 5 pounds to more than 9 pounds, according to Baby Center.

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