At 22 weeks pregnant, you are not quite 6 months along. You’re closer to 5 and a half months, firmly in the second trimester. The confusion is understandable because pregnancy months and weeks don’t line up as neatly as most people expect.
Why Weeks and Months Don’t Match Up
A full-term pregnancy lasts about 40 weeks from the first day of your last menstrual period. If you divide 40 weeks by 9 months, each month works out to roughly 4.4 weeks, not a clean 4. That extra fraction of a week per month is why the math feels off no matter how you count.
ACOG, the professional organization for obstetricians, groups the weeks this way: month 5 covers weeks 17 through 20, and month 6 covers weeks 21 through 24. By that breakdown, 22 weeks falls in the early part of month 6. But many pregnancy apps and books use slightly different cutoffs, which is why you’ll see conflicting answers online. The important thing is that you’re solidly in the second trimester, which runs from 14 weeks and 0 days through 27 weeks and 6 days.
Doctors track pregnancy in weeks and days (like “22 and 3/7 weeks”) rather than months, because weeks are more precise. If your provider says you’re 22 weeks, that’s the number that matters for your care.
What Your Baby Looks Like at 22 Weeks
Your baby is about 7.5 inches (190 millimeters) long measured from the top of the head to the rump, and weighs roughly 1 pound (460 grams). That’s about the size of a papaya. Facial features are becoming more defined, and your baby is active enough that you’re likely feeling regular movement by now.
One of the most significant developments happening around this time involves the lungs. The specialized cells responsible for producing surfactant, a substance that keeps the tiny air sacs in the lungs from collapsing, begin maturing after about 20 weeks. Between weeks 20 and 24, these cells start forming the structures needed to eventually produce surfactant in meaningful quantities, though the lungs won’t be mature enough for independent breathing for several more weeks.
Why 22 Weeks Is a Medical Milestone
Twenty-two weeks is often discussed as the earliest edge of viability, the point at which survival outside the womb becomes possible with intensive medical intervention. A large study published in Pediatrics, covering nearly 23,000 infants born between 22 and 25 weeks at over 600 U.S. hospitals, found that about 25% of all babies born at 22 weeks survived. Among those who received active life support after birth, the survival rate was 35.4%.
Those numbers have been climbing. The proportion of 22-week infants receiving active treatment rose from about 62% in 2020 to nearly 74% in 2022, reflecting a shift in how hospitals approach extremely early births. Still, survival without severe complications at 22 weeks was only about 6.3%, which is why every additional week of pregnancy at this stage makes a meaningful difference.
What You’re Feeling Right Now
At 22 weeks, the top of your uterus sits right around your belly button. Your healthcare provider may start measuring the distance from your pubic bone to the top of the uterus (called fundal height) at appointments. This measurement in centimeters roughly matches your week of pregnancy during the second half, so you’d expect something close to 22 centimeters.
You may start noticing Braxton Hicks contractions around this time. These feel like a mild tightening across your belly that comes and goes without a pattern. They’re more common in the afternoon or evening, after physical activity, or after sex. Drinking water and emptying your bladder can help them ease up. If contractions start coming at regular intervals and grow stronger, that’s a different situation and worth calling your provider about, since it could signal preterm labor.
Other common changes at this stage include lower back pain as your center of gravity shifts, visible swelling in your feet and ankles (especially by the end of the day), and skin stretching across your belly. Your blood volume is also increasing significantly, which can cause occasional dizziness if you stand up too quickly.
The Short Answer
Twenty-two weeks is the beginning of month 6, not the end. You’re about 5.5 months pregnant, with roughly 18 weeks still to go. If someone asks how far along you are, “five and a half months” is the most accurate casual answer, but your provider will always think in terms of weeks.