At 24 weeks pregnant, your uterus measures roughly 24 centimeters (about 9.5 inches) from the top of your pubic bone to the top of the uterus, a point called the fundus. That puts the top of your uterus a few finger-widths above your belly button, which it reached around week 20. Inside, your baby is about 8.25 inches long from head to rump and weighs around 1.3 pounds.
How Fundal Height Is Measured
Your provider measures uterine size with a flexible tape measure stretched from the top of your pubic bone to the highest point of your uterus. This number, called the fundal height, roughly matches your gestational age in weeks once you’re past 20 weeks. So at 24 weeks, the expected reading is around 24 centimeters; at 28 weeks, about 28 centimeters, and so on.
The measurement isn’t precise down to the millimeter. Your clinician’s technique, your body weight, fetal position, the amount of amniotic fluid, and even placental size can all shift the reading by a centimeter or two in either direction. A reading within about 2 centimeters of the expected number is generally considered normal. If the measurement falls noticeably outside that range, your provider will typically follow up with an ultrasound rather than relying on the tape alone.
Why It Might Measure Larger or Smaller
A fundal height that comes in higher than expected doesn’t automatically mean something is wrong. Common explanations include carrying twins or multiples, having more amniotic fluid than average, or simply having a larger baby. Uterine fibroids or an ovarian cyst can also make the uterus feel bigger than it is. Even a miscalculated due date can make the numbers look off. Implantation bleeding is sometimes mistaken for a last menstrual period, which shifts the estimated gestational age by two to three weeks and makes later measurements appear too large.
A smaller-than-expected measurement can reflect a baby who is growing more slowly, lower amniotic fluid levels, or the baby sitting in a position that makes the uterus harder to measure accurately. In either case, an ultrasound gives your provider a clearer picture of what’s happening inside.
What the Growth Feels Like
By 24 weeks your uterus has expanded well beyond the pelvis, and the ligaments that anchor it are under real tension. The most common sensation this produces is round ligament pain, a sharp, stabbing, or pulling feeling in your lower abdomen, hips, or groin. It tends to flare when you change positions quickly, sneeze, cough, or roll over in bed. The second trimester (weeks 14 through 27) is peak season for it because the uterus is growing rapidly but your body hasn’t fully adapted to the added stretch.
Most people describe round ligament pain as brief cramps or spasms that ease with rest or a slow change of position. If the pain doesn’t let up with rest, or if it comes with vaginal bleeding or regular contractions, that’s worth bringing up with your provider promptly.
How Your Baby Fits at This Size
At 24 weeks, the baby is roughly the length of an ear of corn from head to rump. Weighing in at about 630 grams (1.3 pounds), the baby still has plenty of room to move, which is why kicks and rolls tend to become more noticeable right around this stage. The uterine walls are stretching, but they’re also muscular enough to provide a snug, cushioned environment. Over the next several weeks the baby will gain weight more aggressively, and the uterus will keep pace, rising roughly a centimeter per week toward the rib cage by the third trimester.
Tracking Growth Between Visits
You can get a rough sense of your own fundal height at home by lying flat and feeling for the firm top of the uterus above your belly button. At 24 weeks it should sit a couple of inches above the navel. This isn’t a substitute for a clinical measurement, but it can help you understand what your provider is checking at each prenatal visit. If you notice a sudden jump in belly size or an unexpected change in how your abdomen feels, mention it at your next appointment so it can be measured properly.