At 22 weeks pregnant, your baby measures about 7.5 inches (190 millimeters) from crown to rump and weighs roughly 1 pound (460 grams). That’s measured from the top of the head to the bottom, not including the legs. If you measured head to toe, the total length would be closer to 11 inches. For a quick visual, your baby is about the size of a papaya or a small coconut.
What Those Measurements Mean
The crown-to-rump measurement is the standard way doctors track fetal size during ultrasounds because the legs are often curled up, making a full-length measurement unreliable. At 1 pound, your baby has roughly doubled in weight over the past four weeks and will continue gaining at an accelerating pace from here. By the end of the second trimester (week 27), most babies weigh about 2 pounds, so the next several weeks involve rapid growth.
Keep in mind that these are averages. Your baby may measure slightly larger or smaller, and that’s normal. Your provider tracks growth trends over multiple appointments rather than relying on any single measurement.
What’s Developing at 22 Weeks
Size is only part of the picture. At 22 weeks, your baby’s body is going through critical changes that set the stage for life outside the womb.
The lungs are one of the most important organs developing right now. Cells in the lungs are beginning to produce surfactant, a slippery substance that keeps the tiny air sacs from sticking together. Without enough surfactant, a baby can’t breathe effectively on its own. Production starts around this time but won’t reach adequate levels for several more weeks.
Your baby’s skin is still thin and somewhat translucent, with blood vessels visible underneath. A fine layer of soft hair called lanugo covers the body, helping to hold a waxy, white coating (vernix) against the skin. That coating protects the skin from the amniotic fluid and will mostly shed before birth, though some babies are born with patches of it still clinging to their skin.
The eyes are formed but the irises still lack pigment. Your baby can perceive light and dark, and the eyelids are now capable of opening and closing. Hearing is also coming online. The inner ear structures are developed enough for your baby to pick up sounds, particularly your voice and heartbeat, which travel easily through amniotic fluid.
Feeling Your Baby Move
Most people start feeling fetal movement around 20 weeks, so by 22 weeks you’ve likely noticed something. Early kicks don’t feel like kicks at all. They’re more like flutters, swishes, rolls, or a sensation some describe as butterflies. The baby is still small and doesn’t have the strength for the dramatic jabs that come later.
At this stage, movement patterns are irregular and unpredictable. Your baby sleeps in cycles and may be most active when you’re resting. Formal kick counting, where you track a set number of movements within a time window, isn’t typically recommended until the third trimester (around week 28). Before then, simply noticing that you feel movement from time to time is enough.
How Your Body Is Changing
Your uterus has grown to match. After about 20 weeks, the distance from your pubic bone to the top of the uterus (called fundal height) roughly equals the number of weeks you are in pregnancy, give or take 2 centimeters. At 22 weeks, your provider would expect that measurement to fall somewhere between 20 and 24 centimeters. This quick check at prenatal appointments is one way to confirm the baby is growing on track without an ultrasound.
You’re likely noticing your belly becoming more obviously rounded. Many people experience round ligament pain, a sharp or pulling sensation on the sides of the lower abdomen, as the uterus stretches. Back pain, leg cramps, and swelling in the feet often start or intensify around this time as your center of gravity shifts forward.
Viability at 22 Weeks
Twenty-two weeks is considered the very edge of viability, the earliest point at which a baby born prematurely has any chance of survival with intensive medical care. The numbers are sobering but worth understanding.
A large study published by the American Academy of Pediatrics, covering births from 2020 to 2022, found that about 25% of all infants born at 22 weeks survived to leave the hospital. Among those who received active life support after birth (which happens in about 68% of 22-week deliveries), the survival rate was higher, around 35%. For context, survival jumps to roughly 53% at 23 weeks and 71% at 24 weeks.
Survival alone doesn’t capture the full picture. Only about 6% of babies born at 22 weeks survived without severe complications. Those who did survive spent a median of 160 days, more than five months, in the neonatal intensive care unit, and many went home dependent on medical technology like supplemental oxygen or feeding tubes. These outcomes improve significantly with each additional week of pregnancy, which is why every day matters at this stage of development.
This information isn’t meant to cause worry. The vast majority of pregnancies continue well past 22 weeks. But understanding viability can be helpful context, especially if you’re at higher risk for preterm birth or simply want to know where your baby stands developmentally.