When Is 6 Months Pregnant? What to Expect

Pregnancy is counted in weeks, not months, which is why the six-month mark can feel fuzzy. Six months pregnant generally means you are between 23 and 27 weeks along. You are in the second trimester, nearing the end of it, and your baby is growing fast.

When Is 6 Months Pregnant in Weeks?

Most clinicians consider the sixth month of pregnancy to run from about 23 weeks through 27 weeks. That puts the end of month six just before the third trimester begins.

Here is where the confusion comes from. A pregnancy is measured at 40 weeks from the first day of your last menstrual period. Divide 40 by roughly 4.3 weeks per month and you get about nine calendar months. But months and pregnancy weeks do not line up neatly, so different sources draw the boundaries in slightly different places.

Some providers count month six as weeks 21 through 24. Others use weeks 23 through 27. Neither is wrong. The week number matters far more than the month label for anything clinical.

One useful anchor: 28 weeks is the start of the third trimester. So if you are 27 weeks, you are in the final days of month six and about to cross into the last stretch of pregnancy.

What Is Happening With Your Baby at 6 Months?

By 23 to 27 weeks, your baby has moved well past the early developmental stages. Every major organ system has formed. The work now is growth and maturation.

Several changes are well documented in this window:

• Lungs: The airways and air sacs are developing, but the lungs are not yet ready for breathing air. Surfactant, the substance that keeps air sacs from collapsing, is being produced but is not yet at mature levels.
• Eyes: The eyelids, fused shut earlier in pregnancy, begin to open. The retina continues to develop.
• Hearing: Your baby can detect sounds from outside your body, including your voice and your heartbeat.
• Movement: Kicks, rolls, and hiccups become stronger and more regular. Many people feel consistent movement by this point.
• Skin: Still thin and covered in fine hair called lanugo, plus a waxy coating called vernix that protects the skin.
• Brain: Rapid growth continues, and the nervous system is wiring itself for the tasks of life outside the womb.

Your baby is roughly the length of an ear of corn or a large eggplant at this stage, though exact size varies widely and is not a reliable measure of health on its own.

What Symptoms Can You Expect at 6 Months Pregnant?

The second trimester is often described as the most comfortable stretch of pregnancy, but six months brings its own set of changes. Symptoms vary a lot from person to person.

Common experiences include:

• A growing belly that changes your center of gravity and may cause lower back pain
• Heartburn or acid reflux, as your growing uterus presses upward on your stomach
• Swelling in the feet, ankles, and hands
• Leg cramps, especially at night
• Shortness of breath as the uterus pushes against your diaphragm
• Trouble sleeping, partly from discomfort and partly from frequent trips to the bathroom
• Braxton Hicks contractions, which are irregular, painless tightenings of the uterus
• Stretch marks on the belly, breasts, or thighs
• Skin changes, including darkening of the line down your belly or patches on your face

Braxton Hicks contractions are worth understanding. They are practice contractions that do not follow a pattern and usually stop if you change position or drink water. True preterm labor contractions are regular, get stronger over time, and do not let up. If you are unsure which you are feeling, call your provider.

What Appointments and Tests Happen Around This Time?

The exact schedule depends on your provider and your individual situation. That said, a few standard items tend to fall in this window.

If you have not already had it, the glucose challenge test for gestational diabetes is commonly done between 24 and 28 weeks. You drink a sugary solution, wait about an hour, and have your blood drawn. If the result is elevated, you may be asked to return for a longer, more definitive test.

You may also receive a Tdap vaccine during pregnancy, often in the later second or early third trimester. This is recommended so that protective antibodies pass to your baby before birth. Timing and recommendations can change, so confirm the current guidance with your provider.

Your provider will keep tracking your blood pressure, weight, and urine, and will listen to your baby’s heartbeat. If you have risk factors for preterm birth, they may check your cervix length by ultrasound.

If you have not felt your baby move by around 24 weeks, mention it. Most people feel movement before then, but first pregnancies sometimes run later.

How Can You Stay Comfortable and Healthy at 6 Months?

There is no single formula, but a few practical steps tend to help. None of these replace what your provider tells you specifically.

Sleep on your side rather than your back, especially as the belly grows. Lying flat on your back can put pressure on a major vein and reduce blood flow. A pillow between your knees and one under your belly can make side sleeping easier.

Eat smaller meals more often if heartburn is a problem. Avoid large meals right before bed. Staying upright for a while after eating also helps.

Stay active in ways that feel manageable. Walking, swimming, and prenatal yoga are commonly recommended. Check with your provider before starting anything new or intense.

Keep up with your prenatal vitamin, which typically includes folic acid, iron, and other nutrients. Do not add extra supplements without asking your provider first. Some vitamins and herbs are not safe in pregnancy.

Watch for warning signs that need a call right away:

• Bleeding or fluid leaking from the vagina
• Regular contractions or a pattern of tightening
• Severe or persistent abdominal pain
• A severe headache, vision changes, or sudden swelling of the face and hands
• A decrease in your baby’s usual movement
• Fever or chills

These signs can point to problems that need prompt care. Trust your instincts. If something feels wrong, call.

What Changes as You Move Toward the Third Trimester?

Six months is a transition point. The relative comfort of the second trimester starts to give way to the heavier, more tiring third trimester.

Your baby will keep gaining weight and building fat stores. The lungs will keep maturing. Movement will feel different as space gets tighter, shifting from sharp kicks to rolls and stretches.

Your own body will work harder. Blood volume is already well above pre-pregnancy levels, and your heart is pumping more. Fatigue often returns. Breathing gets more effortful as the uterus crowds the diaphragm.

This is also when many people start thinking seriously about birth plans, childcare, and what they need at home. It is a good time to line up support and ask your provider any questions you have been putting off.

Does the Week Number Matter More Than the Month?

Yes, and this is worth remembering. Every clinical decision in pregnancy is based on weeks and days, not months.

Gestational age determines when tests are done, when certain interventions are considered, and how a baby’s maturity is judged. The month label is a convenience for conversation, not a medical measurement.

So when someone asks how far along you are, the week number is the more useful answer. If you are 24 weeks, you are 24 weeks. The month is just a rough translation.