At 22 weeks pregnant, your baby is about 7.5 inches (190 millimeters) long from crown to rump and weighs roughly 1 pound (460 grams). Measured from head to toe, the total length is closer to 11 inches. That’s comparable in size to a small cucumber. Your baby is still light enough to hold in one hand, but a lot is happening beneath the surface this week.
How Big 22 Weeks Really Looks
Most pregnancy apps compare your baby to a fruit or vegetable at each stage, and at 22 weeks the common comparison is a Lebanese cucumber, roughly 27 to 28 centimeters long and just under a pound. The “crown to rump” measurement you’ll see in medical contexts only captures the length from the top of the head to the tailbone, since the legs are curled up during ultrasounds and hard to measure consistently. That’s why sources sometimes list a shorter number like 7.5 inches rather than the full head-to-toe length.
Weight can vary by a few ounces from one baby to another at this point, and your provider may give you an estimate during an ultrasound. These estimates aren’t perfectly precise, so a range of roughly 400 to 500 grams is normal.
What Your Baby Looks Like Right Now
At 22 weeks, your baby’s skin is still thin and somewhat transparent, with blood vessels visible underneath. Two protective layers are forming. The first is lanugo, a coat of fine, soft hair that covers the scalp, forehead, cheeks, shoulders, and back. The second is vernix, a thick, waxy substance that coats the skin and shields it from the amniotic fluid your baby is floating in. Both of these are completely normal and will mostly disappear before birth, though babies born early often still have visible lanugo.
Facial features are becoming more defined this week. Eyebrows and eyelids are formed, and your baby’s lips are more distinct. The body is starting to fill out slightly as fat deposits begin to develop, though your baby still looks lean compared to a full-term newborn.
Hearing Begins This Week
One of the most exciting milestones around 22 weeks is the start of hearing. Your baby may begin reacting to your voice by moving their arms, legs, and head. The sounds your baby hears are muffled by amniotic fluid and the layers of your body, so what reaches them is more like a low rumble than a clear voice. Still, your heartbeat, digestion, and speech are the soundtrack of their world right now. Some parents start talking, reading, or playing music to their baby around this time, knowing that these sounds are registering.
Lung Development Is Underway
Your baby’s lungs are in an early but critical phase of development at 22 weeks. The specialized cells responsible for producing surfactant, a substance the lungs need to inflate properly after birth, are increasing in number and maturity starting around week 20. Small structures called lamellar bodies, which store surfactant, first appear within these cells between 20 and 24 weeks. But the lungs won’t produce enough surfactant to function well on their own until much closer to full term. This is one of the main reasons extremely premature babies need breathing support.
Movement You Can Feel
If you haven’t felt your baby move yet, 22 weeks is around the time many people start noticing clear kicks and rolls rather than the subtle flutters of earlier weeks. Your baby is big enough now that their movements can press against the walls of the uterus with enough force to feel from the outside. Movement patterns at this stage are irregular. Your baby sleeps in short cycles throughout the day, and you’ll notice more activity during some hours than others. There’s no need to count kicks yet; that typically becomes relevant later in the third trimester.
What’s Changing in Your Body
Your uterus is growing to keep pace with your baby. A common way providers track this is by measuring fundal height, the distance from your pubic bone to the top of your uterus. After 20 weeks, this measurement in centimeters roughly matches the number of weeks you are, plus or minus 2 centimeters. So at 22 weeks, a fundal height of about 20 to 24 centimeters is typical. Your provider may start checking this at routine visits as a simple way to confirm your baby is growing on track.
Survival If Born at 22 Weeks
Twenty-two weeks is widely considered the earliest edge of viability, the point at which survival outside the womb becomes possible with intensive medical intervention. This is a question many parents think about, especially those facing complications. The numbers have improved significantly in recent years. In 2014, about 26 percent of babies born at 22 weeks who received active treatment survived. By 2023, that figure had risen to 41 percent, according to a large study published in JAMA. A major factor in this shift is that more hospitals are choosing to provide active treatment at 22 weeks: the rate climbed from about 29 percent to nearly 79 percent over the same period.
These survival rates come with important context. Babies born this early face serious risks of long-term health challenges, and outcomes vary widely depending on the hospital’s level of neonatal care. For the vast majority of pregnancies progressing normally at 22 weeks, these statistics are simply reassuring background knowledge rather than something to worry about.