40 Weeks Pregnant: Symptoms, Baby Development, and What to Expect

At 40 weeks pregnant, the baby is considered full term and labor may begin at any time, although some pregnancies continue beyond the due date. This week often brings stronger pelvic pressure, changes in discharge, and frequent questions about what is normal, what to do next, and when to seek medical care.

Overview: 40 Weeks Pregnant

At 40 weeks pregnant, the due date has arrived, and the baby is fully developed enough for life outside the uterus. Many people expect labor to begin exactly on this date, but a due date is an estimate rather than a fixed deadline. It is normal for labor to start before or after 40 weeks.

This stage can feel both exciting and tiring. Physical discomfort often increases because the baby is low in the pelvis, and emotional tension may rise as families wait for clear signs of labor. Regular contact with the maternity care team remains important, especially if there are changes in fetal movement, leaking fluid, or contractions that become regular.

Care in the final days of pregnancy usually focuses on maternal comfort, fetal well-being, and watching for labor or medical concerns. If pregnancy extends beyond the due date, clinicians may recommend additional monitoring and discuss whether labor should be encouraged or induced, depending on the individual situation.

Symptoms This Week

Symptoms at 40 weeks pregnant often reflect the baby’s low position and the body’s preparation for labor. Pelvic pressure is very common, and many people notice discomfort when walking, standing, or turning in bed. Backache, fatigue, and interrupted sleep may also become more noticeable.

Contractions can continue to be irregular and unpredictable. Braxton Hicks contractions may feel like tightening that comes and goes without becoming stronger or closer together. In contrast, true labor contractions usually become more regular, more intense, and harder to ignore over time. Some people also notice a small amount of blood-tinged mucus, sometimes called the mucus plug or a “bloody show,” as the cervix begins to change.

Digestive symptoms may continue this week. Heartburn, feeling full quickly, mild nausea, constipation, or frequent bowel movements can occur as hormones and pressure affect the digestive tract. Increased urination is also common because the baby’s head may press on the bladder.

• Pelvic heaviness or pressure
• Lower back discomfort
• Irregular contractions
• Fatigue and poor sleep
• More vaginal discharge or mucus
• Frequent urination

Although many of these symptoms are expected, sudden swelling, severe headache, visual changes, heavy bleeding, or a clear gush of fluid should not be ignored. These can signal a need for urgent assessment.

Baby Development at 40 Weeks

At 40 weeks, the baby is considered full term. Most major organs are developed, and the lungs are usually mature enough for breathing after birth. The baby continues to practice swallowing, breathing movements, and moving the arms and legs, even though there is less room inside the uterus.

A baby at this stage is often compared in size to a small pumpkin or watermelon, though size varies widely from one pregnancy to another. Weight and length are influenced by genetics, maternal health, and other factors, so ultrasound estimates near the due date can be helpful but are not exact.

The baby may move differently now—not necessarily less, but with a different pattern because space is tight. Rolls, stretches, and pushes may replace bigger kicks. Consistent daily movement is still expected, and any clear decrease in movement should be reported promptly. If there are concerns about fetal well-being, doctors may use ultrasound and heart rate monitoring, which may be part of care in perinatology evaluation.

As birth approaches, the baby is usually head-down and engaged lower in the pelvis. If position is uncertain or the baby is not head-down, the care team may review labor planning and delivery options.

Body Changes at 40 Weeks

The body continues preparing for labor at 40 weeks pregnant. The cervix may begin to soften, thin out, and open, although these changes do not always predict exactly when labor will begin. Some people notice cramping similar to menstrual cramps, while others feel very little until labor is clearly established.

The abdomen may look lower than before because the baby has descended into the pelvis. This can make breathing feel slightly easier, but bladder pressure often increases. Walking may feel slower or more uncomfortable, and there may be added strain on the hips, groin, and lower back.

Vaginal discharge can increase this week. A thick mucus discharge, sometimes streaked with pink, brown, or red, may appear as the cervix changes. This is often normal, but heavy bleeding is not. In addition, spontaneous rupture of membranes may happen before labor or during labor. A constant trickle or sudden gush of clear or pale fluid can mean the water has broken and should be reported.

Emotionally, this week can bring impatience, anticipation, worry, and excitement at the same time. These feelings are common. Gentle support, rest, hydration, and practical preparation can help reduce stress while waiting for labor to begin.

Checklist: What to Do at 40 Weeks

Rather than trying to predict the exact start of labor, it can help to focus on a short, practical plan for the week. Keeping routines simple can make this period feel more manageable. Rest when possible, eat light balanced meals, and drink enough fluids unless a doctor has advised otherwise.

Daily attention to fetal movement remains important. Many clinicians advise contacting the maternity team if there is a noticeable reduction in the baby’s usual pattern of movement. It is also helpful to review the difference between Braxton Hicks contractions and labor contractions, and to know when to leave for the hospital or call for advice.

• Keep hospital bags, documents, and baby essentials ready
• Track contractions if they become regular
• Watch for leaking fluid or bleeding
• Monitor fetal movement every day
• Attend all scheduled prenatal visits
• Ask the care team about the plan if pregnancy goes beyond 40 weeks

If labor does not begin on its own, the care team may discuss additional testing or ways to support delivery, depending on the pregnancy. In some situations, labor and delivery care includes monitoring, membrane assessment, or induction planning. Where there are pregnancy-related concerns such as blood pressure disorders, doctors may also evaluate for conditions such as preeclampsia.

How Labor and Diagnosis Are Assessed

Assessment at 40 weeks pregnant is focused less on diagnosing a disease and more on confirming maternal and fetal well-being and identifying whether labor has started. A clinician may ask about contraction timing, leaking fluid, fetal movement, vaginal bleeding, and any symptoms such as headache or visual changes.

Physical examination may include checking blood pressure, measuring the abdomen, listening to the fetal heart rate, and sometimes examining the cervix. A cervical exam can show whether the cervix is dilating or thinning, but it cannot predict the exact timing of birth. If labor is suspected, the pattern of contractions and cervical change over time are more informative than a single exam.

If pregnancy goes beyond the due date or there is concern about the baby, monitoring may include a nonstress test, ultrasound, or a biophysical profile. These tools help the care team assess movement, breathing activity, muscle tone, amniotic fluid, and heart rate response. Ultrasound may also help estimate the baby’s position and fluid level, often through obstetric ultrasound.

When symptoms suggest a problem outside normal late pregnancy changes, doctors may also assess for related conditions such as gestational diabetes or hypertension, especially if these have already been part of the pregnancy history.

What to Expect if Pregnancy Continues Beyond the Due Date

Reaching 40 weeks does not automatically mean anything is wrong. Many healthy pregnancies continue for several more days before labor starts naturally. The care team usually considers the full clinical picture, including maternal health, fetal movement, cervical findings, and any pregnancy complications, before recommending a next step.

If pregnancy continues past 40 weeks, appointments may become more frequent. Extra monitoring can help confirm that the placenta is still supporting the baby well and that amniotic fluid remains at a healthy level. In some cases, induction of labor may be recommended if there are signs that continuing the pregnancy could carry more risk than delivery.

Induction can involve different methods, such as medications or procedures used to help the cervix soften and contractions begin. The exact approach depends on the cervix, the baby’s position, prior birth history, and the overall medical situation. The doctor or midwife will explain the possible benefits and limitations of each option.

Near the end of pregnancy, individualized planning matters. Acibadem International’s multidisciplinary specialists in JCI-accredited hospitals diagnose and manage late-pregnancy concerns for international patients, including monitoring and birth planning when pregnancy reaches or passes the due date.

When to Seek Medical Care

At 40 weeks pregnant, it is important to contact a doctor, midwife, or maternity unit if there are signs of labor or symptoms that could suggest a complication. Knowing when to call can reduce uncertainty and help families act promptly when needed.

Immediate or same-day medical advice is usually needed if contractions become regular and stronger, if the water breaks, or if there is any concern about the baby’s movement. Many maternity teams provide specific guidance on contraction timing and when to come to the hospital, especially for a first pregnancy or if there have been prior complications.

• Noticeably decreased or absent fetal movement
• A gush or steady trickle of fluid from the vagina
• Heavy vaginal bleeding
• Regular, painful contractions getting closer together
• Severe headache, visual changes, or sudden swelling
• Fever, severe abdominal pain, or feeling unwell

Even if a symptom turns out to be part of normal late pregnancy, it is appropriate to ask for advice. A qualified maternity clinician can help determine whether reassurance, monitoring, or urgent care is needed.

Frequently asked questions

Is it normal not to be in labor at 40 weeks pregnant?

Yes. A due date is an estimate, and many healthy pregnancies continue beyond 40 weeks. The maternity care team usually monitors both mother and baby and advises when additional assessment or induction should be considered.

What does the baby look like at 40 weeks?

At 40 weeks, the baby is fully developed enough for birth and usually has mature lungs and a good amount of body fat. Size varies, but the baby is often compared to a small pumpkin or watermelon.

Are cramps and pressure normal at 40 weeks pregnant?

Mild cramping, pelvic pressure, and back discomfort are common because the baby is low in the pelvis and the cervix may be changing. However, severe pain, heavy bleeding, or pain with reduced fetal movement should be assessed promptly.

How can someone tell the difference between Braxton Hicks and real labor?

Braxton Hicks contractions are often irregular, do not steadily become stronger, and may ease with rest or hydration. True labor contractions usually become more regular, more intense, and closer together over time.

What should someone do if the baby seems to be moving less at 40 weeks?

A clear decrease in the baby's usual movement pattern should be taken seriously. The person should contact their doctor, midwife, or maternity unit right away for advice and possible monitoring.

When is induction discussed after 40 weeks pregnant?

Induction may be discussed if pregnancy continues beyond the due date, especially if there are maternal or fetal concerns. The timing depends on the pregnancy history, examination findings, and results of any monitoring tests.

References

• World Health Organization
• American College of Obstetricians and Gynecologists
• National Institute for Health and Care Excellence
• Centers for Disease Control and Prevention

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.