40th Week Pregnancy: Symptoms, Baby Development, Tips And Body Changes

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The 40th week is almost the end of pregnancy. You have completed nine months and are ready for delivery anytime soon. In fact, many pregnant women do not even reach this week as they deliver before 40 weeks. But in some cases, the 40th week might just pass without any specific signs of labor.

Momjunction explains the symptoms of pregnancy in the 40th week, the changes that happen in your baby and your body, and the ways to cope with the situation.

What Are The Pregnancy Symptoms At 40 Weeks?

In the 40th week of pregnancy, you might have the below symptoms (1), (2), (3), (4):

  1. Pelvic pain and discomfort: The baby goes down further, putting more pressure on the pelvis and thus causing pain and discomfort. Moreover, the head movements of the baby inside the womb will give you sharp pain in the pelvic area.
  1. Lightening: With the baby moving down, the pressure from your ribs is released. This helps you breath easier and relieves heartburn.
  1. Braxton Hicks: The false contractions become more frequent, and you might mistake them to be real labor. If you are getting Braxton Hicks contractions regularly, your doctor may do a vaginal examination to identify the cervical dilation. This, in turn, helps you know if the contractions are real or false. The doctor may ask you to keep track of the time gap between contractions to know if they are false or true. True labor contractions differ from Braxton Hicks contractions by becoming more intense, more regular as time passes and they never disappear with rest.
  1. Vaginal discharge: A thick mucus plug is discharged through your vagina as the baby pushes down to the birthing canal. This vaginal discharge could be white and clear or tinged with blood appearing slightly pinkish. This is called the bloody show.
  1. Painful leg cramps: You might experience them especially in the night. To ease the pain, you can gently flex your ankle and toes back towards the shin.
  1. Backaches: The pressure exerted by the baby’s head further into the pelvis and your postural changes could result in backaches.
  1. Insomnia: The discomforts will be at their peak, and you may feel fatigued due to lack of sleep. Getting a relaxing head massage can help you get proper sleep. The increase in hormonal levels and the extra weight make you feel exhausted.
  1. Low blood pressure: Hormonal changes cause the blood vessels to expand during pregnancy. The pressure put by the growing uterus on these expanded blood vessels reduce the blood flow to heart from the lower part of the body, causing a drop in the blood pressure.
  1. Varicose veins and hemorrhoids: The restriction in blood flow to the heart can cause the blood to pool in the leg veins and near the rectum, leading to varicose veins and hemorrhoids.
  1. Slowdown in fetal activity: As the baby reaches full-term, there won’t be enough space for him/her to move freely, thereby decreasing the movements.

[ Read: 41st Week Pregnancy ]

  1. Frequent urination: The enlarged uterus puts pressure on your bladder, thus making you pee frequently. Also, an increase in the blood flow to the kidneys, and the relaxed urinary tract muscles (due to the increase in the progesterone level) result in frequent urination.
  1. Swelling: Severe swelling of hands, face, and feet is a common symptom noticed towards the 40th week. The increasing estrogen level causes water retention. To avoid the swelling, keep your feet raised over a plank. Circle both the ankles clockwise and anti-clockwise to ease the discomfort. Stretch your toes upward and downward. Walking regularly is also recommended to decrease swelling.
  1. Hot flashes: It is the most common symptom you may notice towards your due date. Wearing breathable clothes and keeping yourself hydrated will help you stay cool.
  1. Early signs of labor: You are most likely to have labor contractions and water break in this week. In such case, call your doctor or visit the hospital.

In addition to the pains and discomfort, you witness some changes in your body in this week.

Did you know? (19) (20)

  • Only 5% of babies are born on their due date.
  • The placenta triggers the hormones for milk production.
  • Babies born at term can regulate their temperature better, effectively suck and swallow compared to babies born earlier.
  • The first labor takes around 14 to 17 hours with the subsequent ones lasting for 6 to 8 hours.

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Changes In Your Body In Week 40

Here are some of the physical and emotional changes you may notice in the 40th week:

  1. Enlarged belly: The belly will be enormously large with the belly button sticking out. With this big belly, an expectant mother faces difficulty in walking and performing other regular activities.
  1. Stretch marks: The stretch marks become more prominent during this period. Applying a moisturizing cream can help relieve the itchiness.
  1. Nesting instinct: Colostrum (the first milk that breasts produce, usually yellow) begins to leak from the nipples.
  1. Cervix dilation: Your cervix starts dilating towards the later stage of pregnancy (5).
  1. Emotional changes: You might go through anxiety and impatience as you are worried about coping with delivery and parenthood. Due to the hormonal changes, you may experience mood swings too.

[ Read: 10th Month of Pregnancy ]

The physical changes mainly occur because your body is getting ready for the delivery, and your baby has grown big.

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How Big Is Your Baby At 40 Weeks?

At 40 weeks, your baby reaches full-term and is about the size of a watermelon. The baby measures 20.2 inches (51. cm) from head to toe and weighs about 7.4 pounds (3.3kg) (6).

Baby’s development at 40 weeks

Let’s see the developmental status of the various parts of your baby’s body (2):

Baby OrgansDevelopment
HairGets thicker and coarser
NailsGrow longer
Lanugo (thin bodily hair)Disappears
SkullBabies develop fontanelles (two soft spots) on the skull. It helps the skull bones to shift one over the other while the baby comes out of the birth canal. It also helps the brain grow furtjer after the baby is born
Digestive systemThe baby’s gut contains a green colored sticky substance called meconium. It forms the first fecal matter of the baby after birth.
Skills and reflexesBy this time, the baby develops 70 natural skills and reflexes that help them respond and react
Protective layer on skinThe baby’s body is covered with creamy coating called vernix caseosa

The changes in your body and the baby are closely monitored during your regular visit to the doctor.

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Your OB/GYN visit:

In addition to the regular check-ups, your last prenatal visit might have the following tests:

  • The physical test includes a pelvic examination to determine the cervical dilation (also called ripening), thinning, and softening. It helps the doctor to ascertain the expected time of labor.
  • Amniotic fluid index (AFI) will be checked to measure the volume of amniotic fluid. The normal AFI value ranges from 5-25cm and for the third trimester the AFI value is around 7cm in average (7). .
  • The non-stress test (NST) measures the fetal heart rate and movements (8).
  • A contraction stress test is done when the NST results are not normal. It helps in determining the response of fetal heartbeat during the contractions.
  • Biophysical profile test (BPP) is a kind of fetal well being test using an ultrasound. It detects the baby’s movements, breathing pattern, level of amniotic fluid and the body tone. This test is performed when NST produces unsatisfactory results or when there are conditions when fetal well being must be monitored.

Note: NST, CST, and BPP can be done at any time during the pregnancy. They will be done if you have health problems or your pregnancy is overdue (longer than 40 weeks).

During your last prenatal visit, your doctor will also discuss the possibility of your pregnancy getting over due to induction of labor or C-section Most importantly, your OB/GYN will advise you to look out for the signs of labor.

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[ Read: Difference Between True And False Labor ]

Signs Of Labor In The 40th Week

Keep an eye on these signs, and contact your doctor accordingly (5):

Contractions get frequent and stronger with time.

  • Light brown or pinkish mucus discharge (also referred to as bloody show)
  • Period-like abdominal cramps
  • Throbbing or dull pain in the lower back
  • Diarrhea
  • Amniotic sac rupture – you might experience frequent contractions if the labor is imminent. Water leak

If the leaking water is colorless, odorless and is gushing or leaking slowly, then it indicates the rupture of amniotic sac. It means your labor will start soon. But even if labour does not start, just let your doctor know.

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What Happens After The Water Breaks?

Most women have a water break before the onset of labor. However, some may have it after the contractions begin.

The rupture of the amniotic sac exposes your baby to various infections (9). The bacteria can travel from the vagina to the uterus, causing infection to both the mother and the baby. To prevent infections, wear a sanitary pad that will keep you dry and clean. Contact your hospital and see the doctor.

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[ Read: Water Break During Pregnancy ]

When To Call The Doctor

You must call a doctor if you (10):

  • Notice a decreased fetal movement (fewer kick counts)
  • Have pain while passing urine as this can indicate urinary infection
  • Experience continuous abdominal pain
  • Have bright red vaginal bleeding
  • Have fever and chills
  • Have no contractions even after the water breaks
  • Leak yellowish or greenish fluid when the amniotic sac ruptures

Note: If the amniotic fluid appears brown or green, then notify your doctor immediately. It happens when your baby passes meconium in the sac and is an indication that your baby is stressed and needs to be delivered as soon as possible (11).

Once you reach the hospital, the doctor may wait for the contractions to begin. If the contraction does not start by itself, then the doctor may induce labor. In some women, the amniotic sac will not rupture until they are into active labor.

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Labor At 40 Weeks Pregnancy

As you enter labor, the pain grows intense and stronger till the cervix opens completely. You may also have cramps. Your doctor will check if you need epidural anesthesia when the pain becomes unbearable.

The average labor time is six hours (12).

In some cases, labor begins naturally but in some other cases, the doctor may induce it.

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Inducing Labor At 40 Weeks Pregnancy

Labor induction helps start the birthing process through medical intervention. Labor is induced in the following cases (13):

  • You have a water break, and the contractions are delayed. Inducing labor will help prevent infections to you and the baby.
  • You have high blood pressure at full-term.
  • Prolonging the pregnancy poses risks to you or your baby.
  • The amniotic fluid is insufficient.

You have long crossed your due date. However, at 40 weeks, you would be advised to wait for a few more days.

[ Read: Labor Induction and Augmentation ]

How is labor induced?

Labor can be induced through traditional methods such as:

  • Sexual intercourse
  • Nipple stimulation
  • Walking
  • Acupuncture

However, there is little scientific evidence to prove their effectiveness (14).

Medical techniques for inducing labor include (15):

  • Membrane stripping or sweeping
  • Oral or vaginal medication
  • Oxytocin administered through IV
  • Rupturing the amniotic sac

Discuss with your doctor about the benefits and risks before you agree for induced labor.

Your delivery will be smooth if your baby is in the right position that is head-down. But if the baby is in a breech position, a normal delivery could become a problem.

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[ Read: 39th Week Pregnancy ]

What If The Baby Is In Breech Position?

By the time you enter labor, the baby moves down into the pelvis with its head down for easy passage through the vagina. But if the baby has its buttocks or legs down, it is called a breech presentation.

Such situation arises in some cases of twin pregnancies, in the absence of sufficient amniotic fluid, the presence of uterine fibroids, and also due to physical abnormalities in the baby (16).

In the case of breech presentation, your OB/GYN will do a pelvic examination or an ultrasound scan to confirm the breech. Once it is confirmed, they might suggest a C-section or external cephalic version (ECV), where the doctor would change the baby’s position manually.

The ECV method helps in getting the baby to head-down position (17). However, in the 40th week, this method is not encouraged by the doctors as there is no room for the baby to move inside.

The breech position will definitely increase your anxiety levels, and anxiety is exactly what you should not have during labor.

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Tips To Help You Cope With Labor

Whether it is a breech position or a head-down, you need to know how to face the situation without getting tensed. Here are some tips you can follow:

  1. Stay calm: Find ways to keep yourself occupied, while the help is on the way. Engage in packing clothes and other things needed for your stay in the hospital. Stay calm as you wait for the onset of labor. You may practice breathing exercises that will help you during delivery.
  1. Do light exercises: Engage in light exercise to keep yourself active. This will also help in inducing labor. But you can do this only in the presence of a professional and with the permission from your doctor.

[ Read: Pregnancy Exercises For Normal Delivery ]

  1. Get good sleep: Try to take a nap before your labor begins. It helps you stay active and push the baby with all your energy.
  1. Spend time with your partner: Talk to your partner. Ask him to massage your back or just keep talking so that you are distracted from the pain and anxiety. His presence will boost your confidence.

Not just presence, the dad-to-be should also participate in the event with all the contribution he can make.

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Tips For Dads-To-Be

Dads, let’s tell you that you will have your own moments of fear and anxiety. So, here are some tips you can follow to ease your emotions:

Know your stuff: Understand what your partner is going through. Make a note of the instructions given by your doctor. Prepare yourself for the D-day so that you can act wisely rather than be terrified when your partner’s water breaks.

  1. Understand what she wants: Once your partner goes into labor, try to understand her preferred method of delivery – whether she wants to get induced, opt a C-section or give birth the natural way.
  1. Do your homework on hospitals: Enquire about the various hospitals in your locality. Weigh the facilities they are offering, their hospital policies, and their track record. This will make it easy for you to contact your preferred hospital when the time comes.
  1. Know when to take charge: While in labor, your partner might not be able to take the right decision. If she is unable to understand what is happening, and what she needs to do, hold her hand and explain the situation patiently.

As you help your partner to deliver, you both will realize that it is not too long before you become parents to a lovely little baby.

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[ Read: How To Calculate Pregnancy Weeks? ]

What Happens Immediately After The Baby Is Born?

This information will prepare you for a series of events that will happen after the birth of your baby.

In babies:

  • Soon after the baby is out, he/she may cry out loudly or stay unconscious due to the medicinal effect.
  • The umbilical cord is cut and clamped.
  • The doctor uses an aspirator to suction the baby’s mouth and throat to remove any traces of fluid. The newborn will be wiped dry and covered in a blanket to provide warmth. The blood sample taken from the umbilical cord will be tested for identifying your baby’s blood group and several other factors.
  • The infant will be administered the necessary vaccinations. Your baby will be given Apgar score based on their physical and health conditions. The doctor will check for the heartbeat, muscle tone, response to stimuli, breathing rate and color of skin for the score.

In mothers:

  • The doctor will first try to stop excess bleeding.
  • She will check the placenta to ensure that no fragments are left inside the uterus because it can cause bleeding or infections.
  • The internal and external stitches, if any, are left to heal on their own.

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[ Read: Uterus During Pregnancy ]

Frequently Asked Questions

1. What if you get unpleasant discharges at 40 weeks?

As the cervix opens, a thick mucus plug with a tint of blood is discharged. It indicates that your labor is closer. However, if the discharge has a foul smell, then it might indicate a vaginal infection that can affect your baby inside. Inform the doctor in such a case.

2. What is a post-term pregnancy?

If a pregnancy lasts beyond 42 weeks, it is termed as post-term pregnancy. It increases the complications of stillbirth, large babies, and fetal mortality. In such cases, a C-section is usually recommended over vaginal delivery to avoid any risks (18) of infections and postpartum hemorrhage.

Post-term pregnancy is not very common and occurs in around 10% of pregnancies. If your labor does not start by 41 weeks, the doctor might try the membrane stripping method to initiate the contractions. If that doesn’t work, then your baby will be monitored closely with ultrasound scans. In this case, medications will be administered to induce labor. The 40th week and the next week are the most crucial time of your pregnancy as the calling could come anytime soon.

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Dr. Burcu Saygan Karamürsel

Burcu Saygan Karamürsel is a board certified obstetrics - gynecology and maternal-fetal medicine specialist working in Ankara,Turkey. A graduate from Hacettepe University Medical School, she has also attended a fellowship programme at Bonn University Hospital, Perinatology Department. Currently, she runs her own private clinic in Ankara and contributes to several newspapers’ online health columns and websites. She is specialized in... more

shreeja pillai

Shreeja holds a postgraduate degree in Chemistry and diploma in Drug Regulatory Affairs. Before joining MomJunction, she worked as a research analyst with a leading multinational pharmaceutical company. Her interest in the field of medical research has developed her passion for writing research-based articles. As a writer, she aims at providing informative articles on health and pharma, especially related to... more