At 22 weeks pregnant, your baby is about 11 inches long from head to heel and weighs roughly 1 pound (around 460 to 480 grams). That’s close to the size of a spaghetti squash or papaya. While the weight might not sound like much, your baby has nearly doubled in size over the past few weeks and is developing rapidly.
Length, Weight, and How Size Is Measured
Fetal measurements can be confusing because doctors use two different starting points. Crown-to-rump length, which measures from the top of the head to the bottom of the buttocks, is about 7.5 inches (190 millimeters) at 22 weeks. Crown-to-heel length, which includes the legs, comes out to roughly 11 inches (29 centimeters). You’ll see both numbers in pregnancy apps and doctor’s notes, so don’t be alarmed if the figures seem inconsistent.
At this stage, your baby gains weight quickly. Fat deposits are starting to form under the skin, which will eventually help regulate body temperature after birth. Over the next several weeks, weight gain accelerates significantly, with your baby roughly tripling in weight between now and 30 weeks.
What Your Baby Looks Like Right Now
A 22-week fetus looks much more like a newborn than the earlier ultrasound images you may have seen. Facial features are well defined: the eyes, nose, and mouth are all in place, though the eyelids are still fused shut. Eyebrows and eyelashes are forming, and the skin, while still thin and somewhat translucent, is starting to be covered in fine, downy hair called lanugo. This soft hair helps hold a waxy, white coating called vernix caseosa against the skin.
Vernix serves several purposes. It protects the skin from being waterlogged after months of floating in amniotic fluid, acts as a barrier against infection, and reduces friction during delivery. It also helps insulate your baby and contains natural antioxidants. Most of it will still be present at birth, especially in skin folds.
Organ Development at 22 Weeks
Your baby’s organs are all present but still maturing. The lungs are in a critical phase of development called the canalicular stage, which runs from about 16 to 26 weeks. During this window, the tiny airways that will eventually handle gas exchange are forming, and the tissue lining the lungs is beginning to differentiate. However, the cells that produce surfactant, the slippery substance that keeps air sacs from collapsing, don’t fully differentiate until 24 to 34 weeks. This is why extremely premature babies often need breathing support.
The digestive system is practicing, too. Your baby swallows amniotic fluid regularly, and the intestines are producing meconium, the dark, sticky substance that becomes your baby’s first bowel movement after birth. The kidneys are filtering fluid and producing urine, which contributes to the amniotic fluid supply.
Hearing and Sensory Development
At 22 weeks, your baby’s auditory system is on the edge of becoming functional. Initial responsiveness to sound starts around 23 weeks, just days away. By 25 to 27 weeks, fetuses begin responding to low-frequency tones, and consistent responses from all fetuses appear between 28 and 30 weeks.
So while your baby can’t quite hear your voice clearly at 22 weeks, the inner ear structures are rapidly wiring up. Within the next few weeks, your baby will start reacting to loud noises and may even show a preference for familiar voices. Talking, reading aloud, or playing music now isn’t pointless; the auditory system is actively preparing to process those sounds.
Movement You Can Feel
If you haven’t felt your baby move yet, 22 weeks is a common time for those sensations to become unmistakable. Early movements often feel like fluttering, bubbling, or light tapping. As your baby grows stronger, those gentle nudges turn into more definite kicks, rolls, and stretches. At this stage, your baby still has plenty of room to move around, so you might feel activity in different parts of your abdomen throughout the day.
Movement patterns at 22 weeks are still irregular. Your baby sleeps in short cycles and may be most active when you’re resting. Consistent kick-counting isn’t typically recommended until around 28 weeks, but noticing general patterns of activity now can help you get familiar with what’s normal for your baby.
The Anatomy Scan
Most people have their mid-pregnancy anatomy scan between 18 and 22 weeks, so yours may be happening right around now. This ultrasound is the most detailed one you’ll get during pregnancy, and it goes far beyond just checking the baby’s size.
The sonographer measures four key dimensions: the width of the head (biparietal diameter), the head circumference, the abdominal circumference, and the length of the thighbone. These measurements help confirm gestational age and track growth. Beyond the numbers, the scan systematically checks the brain, face, heart, spine, kidneys, bladder, and limbs. The heart assessment alone involves multiple views to ensure the chambers, valves, and major blood vessels are forming correctly. The scan also checks that both kidneys are present, that the stomach and heart are positioned on the left side of the body, and that the umbilical cord is inserting properly into the abdomen.
If you haven’t learned the sex of your baby yet, this scan can usually provide that information as well, since the external genitalia are now developed enough to identify.
How Your Body Reflects the Baby’s Size
At 22 weeks, the top of your uterus (the fundus) sits right around your belly button. Your healthcare provider may start measuring the distance from your pubic bone to the top of the uterus at your appointments, a number in centimeters that roughly matches the number of weeks you are. This simple measurement helps confirm that your baby is growing on track between ultrasounds.
You’re likely gaining about a pound a week now, and your center of gravity is shifting as your belly grows. Round ligament pain, backaches, and increased appetite are all common at this stage, driven directly by the fact that your uterus now holds a baby the size of a small squash, plus amniotic fluid and a growing placenta.
Viability at 22 Weeks
Twenty-two weeks sits at the very edge of what’s considered viable outside the womb. Survival rates vary dramatically depending on the hospital. In specialized centers that provide aggressive intervention, survival rates for babies born at 22 weeks can reach 50%. Across broader populations, the rate drops to around 17%. The difference comes down to whether the hospital has the resources and protocols to support extremely premature infants, including advanced respiratory care for lungs that haven’t yet begun producing surfactant.
Babies who do survive at this gestational age face a high likelihood of long-term health challenges, particularly with breathing, vision, and neurological development. Each additional week in the womb significantly improves outcomes, which is why medical teams work hard to delay delivery when preterm labor threatens this early.