Six months pregnant corresponds to roughly weeks 21 through 24, placing you near the end of your second trimester. The confusion is understandable: pregnancy lasts 40 weeks, not a clean nine months, so the math never lines up neatly. By the time you finish week 24, you’re considered six months along, and weeks 25 through 27 carry you through the rest of what many sources call “month six” territory before the third trimester begins at week 28.
Why Weeks and Months Don’t Line Up
Most months have 30 or 31 days, not exactly four weeks (28 days). Over nine months, those extra days add up, which is why 40 weeks of pregnancy doesn’t divide evenly into nine months. Your provider tracks everything by weeks because that level of precision matters for growth milestones, test timing, and due date calculations. When friends or family ask “how many months?” you’re translating from a more exact system into a rougher one, and there’s no single agreed-upon conversion chart.
A practical way to think about it: at 24 weeks you’ve completed six full months. From weeks 25 through 27, you’re in your sixth month and approaching the third trimester, which starts at week 28.
What Your Baby Looks Like at This Stage
During these weeks, your baby is developing fast and starting to look much more like a newborn. At week 23, rapid eye movements begin, and ridges form on the palms and soles that will eventually become fingerprints and footprints. The lungs start producing surfactant, a substance that allows the air sacs to inflate properly after birth.
By week 24, your baby’s skin is still thin and see-through, with a pinkish-red tint from blood vessels visible underneath. At week 25, your baby may respond to familiar sounds, including your voice, and spends most of their sleep time in a dream-like state with rapid eye movement. By week 26, eyebrows and eyelashes have formed, though the eyes may not open for another couple of weeks. At week 27, the nervous system continues maturing, and your baby is adding a layer of fat that smooths out the wrinkled skin. By the end of this stretch, your baby weighs about 2¼ pounds and measures roughly 13¾ inches long.
The Viability Milestone
Week 24 is significant for a reason beyond the calendar. It’s widely considered the threshold of viability, the point at which a baby born early has a meaningful chance of survival with intensive medical care. Survival rates at 24 weeks range from 42% to 59%, according to the American College of Obstetricians and Gynecologists. At 23 weeks, that range drops to 23% to 27%. By 25 weeks, it rises to 67% to 76%. These numbers reflect how rapidly the lungs and other organs mature during this narrow window.
Screening You Can Expect
The sixth month is when most pregnant people are screened for gestational diabetes. The glucose challenge test is typically done between weeks 24 and 28. You’ll drink a sugary solution and have your blood drawn about an hour later to see how your body processes the sugar. If the results come back elevated, a longer follow-up test confirms whether gestational diabetes is present.
Your provider will also likely start measuring your fundal height around this time, checking the distance from your pubic bone to the top of your uterus. This simple measurement gives a quick snapshot of whether your baby’s growth is on track.
How Your Body Feels at Six Months
Your belly is noticeably bigger now, and your breasts continue to grow. That visible growth comes with a set of symptoms that are common but can still catch you off guard. Lower back pain is one of the most frequent complaints, driven by both hormonal changes and the weight of your expanding uterus pulling your center of gravity forward. Leg cramps, especially at night, tend to become more frequent as pregnancy progresses.
You might notice Braxton Hicks contractions for the first time: a mild tightening in your belly that comes and goes, often in the afternoon or evening, or after physical activity. These are not labor contractions. They’re irregular, painless or only mildly uncomfortable, and they go away on their own.
Skin changes are also common in the sixth month. Increased melanin production can create brown or tan patches on your face (called melasma) and a dark vertical line down the center of your belly. Stretch marks may appear on your belly, breasts, thighs, or buttocks. Some people notice small spider veins on their face or legs.
A few less expected symptoms round out the picture. Your body is producing more blood during pregnancy, which can make the inside of your nose swell, leading to stuffiness and nosebleeds. Gums may bleed more easily when you brush or floss. Dizziness from blood flow changes, increased vaginal discharge, and a higher risk of urinary tract infections are all normal parts of this stage.
Nutrition at This Stage
Iron needs increase significantly during pregnancy. The World Health Organization recommends 30 to 60 mg of supplemental iron daily during pregnancy, along with 400 micrograms of folic acid, to reduce the risk of anemia and low birth weight. Your provider may check your iron levels around this time, especially since your blood volume is expanding rapidly. If you’re feeling unusually fatigued or lightheaded beyond what’s typical, low iron could be a factor worth discussing at your next appointment.