At 22 weeks of pregnancy, a fetus measures roughly 11 inches (about 28 centimeters) from head to heel and weighs close to 1 pound, or around 430 to 450 grams. That’s comparable in size to a spaghetti squash or a papaya. While still small enough to fit in the palm of two hands, a 22-week fetus has developed enough distinct features that it looks unmistakably human.
Length, Weight, and Proportions
Earlier in pregnancy, fetuses are measured from the top of the head to the rump because their legs are curled up tightly. By 22 weeks, the legs have straightened enough that the standard measurement shifts to crown-to-heel length, which is why size estimates at this stage can seem like a jump from previous weeks. The head still accounts for a large proportion of overall body size, but the limbs and torso are catching up.
Weight gain accelerates from here. A 22-week fetus is putting on several ounces per week as fat deposits begin to form under the skin. That fat serves two purposes: it will eventually help regulate body temperature after birth, and it fills out the skin, which at this point is still thin, wrinkled, and somewhat see-through.
What a 22-Week Fetus Looks Like
The skin is translucent enough that blood vessels are visible beneath it. A fine, downy layer of hair called lanugo covers the entire body. This hair isn’t permanent. Its job is to help a waxy, protective coating called vernix stick to the skin. Without that coating, the amniotic fluid surrounding the fetus could irritate and damage delicate skin over months of constant exposure.
Facial features are increasingly defined by this point. Eyebrows and eyelashes have appeared, and the eyelids are formed but still fused shut. The lips are more distinct, and the ears have moved into their final position on the sides of the head. Fingernails and toenails are developing, and fingerprints are already forming on tiny fingertips.
Key Developmental Milestones
Inside the body, organs are maturing rapidly but aren’t fully functional yet. The lungs are one of the last organs to reach maturity. At 22 weeks, they are beginning to produce surfactant, a substance that will eventually allow the air sacs to inflate properly, but they’re far from ready for breathing on their own. The brain is growing quickly, with nerve connections forming at a pace that will continue well into the third trimester and beyond.
The inner ear has developed enough that the fetus can detect sound vibrations. While true hearing refines over the coming weeks, many parents notice that loud noises provoke a startle response around this stage. The muscles and nervous system are also coordinated enough to produce regular movement patterns, including stretching, rolling, and grasping the umbilical cord.
What Movement Feels Like at 22 Weeks
Most pregnant people start feeling fetal movement around 20 weeks, and by 22 weeks those sensations are becoming more recognizable. Early movements are often described as flutters, swishes, or a rolling sensation rather than distinct kicks. The fetus is still small enough that its movements don’t carry much force, so some days you may feel a lot of activity and other days very little. This is normal at this stage. Consistent kick-counting routines typically aren’t recommended until later in pregnancy, around 28 weeks, when movements become more predictable.
Activity tends to be more noticeable when you’re sitting or lying still, partly because you’re paying closer attention and partly because your own movement during the day can rock the fetus to sleep.
Viability at 22 Weeks
Twenty-two weeks is often discussed as the edge of viability, the earliest point at which survival outside the womb is possible with intensive medical intervention. This threshold has shifted in recent years. A large study tracking outcomes across U.S. hospitals found that survival rates for infants born at 22 weeks rose from about 26 percent in 2014 to 41 percent in 2023. A major driver of that improvement is that more hospitals are choosing to provide active treatment: the rate jumped from 29 percent to nearly 79 percent over the same period.
These numbers come with important context. Survival at 22 weeks requires immediate, aggressive neonatal intensive care, and the risk of serious long-term health complications is high. Outcomes vary significantly depending on the hospital, the infant’s weight, and other individual factors. Not all hospitals offer resuscitation at this gestational age, and families in this situation typically have detailed conversations with neonatal specialists about what to expect.
How Size Varies Between Pregnancies
The measurements listed above are averages. Individual fetuses can be somewhat larger or smaller depending on genetics, the parent’s health, placental function, and whether it’s a singleton or multiple pregnancy. Ultrasound estimates at 22 weeks can vary by as much as 10 to 15 percent from actual size. Your provider uses a combination of head circumference, abdominal circumference, and femur length to estimate weight and flag any growth concerns. A single measurement that falls slightly outside the average range is rarely a problem on its own. Growth trends over multiple appointments matter more than any single data point.