At 24 weeks pregnant, your baby is about 11.8 to 12 inches long (roughly 30 centimeters) from head to heel and weighs approximately 1.3 pounds, or about 600 grams. That’s close to the length of an ear of corn and roughly the weight of a large cantaloupe. Your baby has been growing rapidly over the past few weeks, and this milestone marks a significant point in development.
Size and Proportions at 24 Weeks
At this stage, your baby’s body is starting to fill out, though there’s still very little fat under the skin. Most of that 1.3 pounds is bone, muscle, and organs. The skin is thin and somewhat translucent, and over the coming weeks your baby will start putting on the fat stores needed to regulate body temperature after birth. The face is fully formed, with eyebrows, eyelashes, and a head of hair beginning to grow in, though the hair has no pigment yet.
Your baby’s proportions are also shifting. Earlier in pregnancy the head was disproportionately large compared to the body, but by 24 weeks the limbs and torso have caught up considerably. The hands can grip, the fingers have distinct fingerprints, and the tiny muscles are strong enough to produce kicks and punches you can feel clearly.
What’s Developing Inside
Size is only part of the story. At 24 weeks, your baby’s organs are hitting critical developmental milestones.
The lungs are one of the most important systems still maturing. Your baby’s lungs are beginning to produce surfactant, a slippery substance that keeps the tiny air sacs from collapsing. At 24 weeks, surfactant production is still in its early stages. Babies born this early almost always experience respiratory distress because surfactant levels are too low to support breathing independently. The lungs will continue maturing well into the third trimester.
The brain is growing quickly, developing more grooves and folds on its surface as neural connections multiply. The visual system is reaching an important stage too. Retinal structures begin forming around week 24, and your baby’s eyes, which have been fused shut, are starting to open. Your baby doesn’t need outside light to develop vision at this point, but the basic architecture for seeing is being laid down now.
The inner ear is also maturing enough that your baby can respond to sounds. Loud noises may cause a startle reflex, and your baby is likely becoming familiar with the rhythm of your voice and heartbeat.
Fetal Movement at This Stage
By 24 weeks, most people feel their baby move regularly. Early movements can feel like flutters, swishes, or butterflies, but by now many of those sensations have graduated to recognizable jabs, rolls, and kicks. Your baby has enough room to shift positions, so you might feel activity in different parts of your abdomen throughout the day.
This is a good time to start paying attention to your baby’s movement patterns. You don’t necessarily need to do formal kick counts yet (many providers recommend starting those around 28 weeks), but getting a sense of when your baby is most active helps you notice if something changes later. A shift in the typical pattern of movement can be an early signal that the baby is under stress, so familiarity with what’s normal for your baby is genuinely useful.
Why 24 Weeks Is a Medical Milestone
Twenty-four weeks is widely recognized as a threshold for viability, the point at which a baby born prematurely has a meaningful chance of survival with intensive medical care. Survival rates for babies born at 24 weeks range from 42% to 59%, according to the American College of Obstetricians and Gynecologists. That’s a significant jump from 23 weeks, where survival rates drop to 23% to 27%, and it climbs further at 25 weeks to 67% to 76%.
Viability depends on more than just gestational age, though. A baby’s sex, weight, genetics, the circumstances of delivery, and whether a neonatal specialist is available all influence outcomes. These numbers represent averages across many hospitals with different levels of resources, which is why the ranges are so wide. For most pregnancies, the goal remains keeping your baby growing as long as possible, since every additional week in the womb dramatically improves outcomes.
Changes in Your Body
Your uterus has grown substantially to accommodate your baby’s size. At 24 weeks, the top of your uterus (the fundal height) sits roughly 24 centimeters above your pubic bone, which is about the level of your belly button or just above it. Healthcare providers measure this distance at prenatal appointments as a quick check that your baby is growing on track. The general rule is that the measurement in centimeters should roughly match your week of pregnancy.
You may also notice your center of gravity shifting as your belly grows, which can affect your balance. Back pain, round ligament discomfort, and increased pressure on your bladder are all common at this stage. Some people notice swelling in their feet and ankles, especially toward the end of the day.
Screenings Around 24 Weeks
If you haven’t already, your provider will likely schedule a glucose screening test sometime between 24 and 28 weeks to check for gestational diabetes. The most common version is a two-step process. The first step doesn’t require fasting: you drink a sugary glucose solution, wait an hour, and then have your blood drawn to measure how your body processed the sugar. If those results come back elevated, a longer follow-up test confirms whether gestational diabetes is present. Some providers use a single-step version that involves fasting beforehand and takes about two hours.
If you have risk factors for gestational diabetes, such as a family history of diabetes or a higher BMI, your provider may have already screened you before 24 weeks. Gestational diabetes is manageable when caught early, typically through dietary changes and blood sugar monitoring, so this routine screening is one of the more important checkboxes in the second half of pregnancy.