Why at least 39 weeks is best for your baby (2024)

Are you thinking about scheduling your baby’s birth?

Scheduling your baby’s birth means you and your health care provider decide when to have your baby by labor induction or Cesarean birth instead of waiting for labor to begin on its own. Depending on your health and your baby’s health, scheduling your baby’s birth may be best. But scheduling birth a little early for non-medical reasons can cause problems for you and baby. If your pregnancy is healthy, it’s best to stay pregnant for at least 39 weeks and wait for labor to begin on its own.

When you schedule your baby’s birth, you schedule either labor induction or a c-section. Labor induction (also called inducing labor) is when your provider gives you medicine or breaks your water (also called amniotic sac) to make your labor begin for vagin*l birth. vagin*l birth is when the muscles of your uterus contract (get tight and then relax) to help push your baby out through the vagin* (also called birth canal). Most babies are born by vagin*l birth. A Cesarean birth (also called c-section) is surgery in which your baby is born through a cut that your provider makes in your belly and uterus.

You may not have a choice about when to have your baby. If there are problems with your pregnancy or your baby's health, you may need to have your baby early. But if you have a choice and you're planning to schedule your baby's birth, wait until at least 39 weeks.

Why does your baby need 39 weeks?

Babies born too early may have more health problems at birth and later in life than babies born later. Being pregnant 39 weeks gives your baby's body all the time it needs to develop.

Your baby needs 39 weeks in the womb because:

  • Important organs, like your baby’s brain, lungs and liver, need time to develop. The brain develops fastest at the end of pregnancy. A baby’s brain at 35 weeks of pregnancy weighs only two-thirds of what it will weigh at 39 to 40 weeks.
  • He’s less likely to have health problems after birth, like breathing, vision and hearing problems.
  • He can gain more weight in the womb. Babies born at a healthy weight have an easier time staying warm than babies born too small.
  • He can suck and swallow and stay awake long enough to eat after he's born. Babies born early sometimes can't do these things.
  • He’s less likely to have learning problems and health problems later in life than babies born before 39 weeks.

Can scheduling an early birth cause problems for you and your baby?

Yes. Sometimes it's hard to know exactly when you got pregnant. Even with an ultrasound, your due date can be off by as much as 2 weeks. If you schedule an induction or c-section and your date is off by a week or 2, your baby may be born too early. Ultrasound uses sound waves and a computer screen to show a picture of your baby inside the womb.

Problems from inducing labor

  • Stronger and more frequent contractions. Frequent contractions may cause changes in your baby’s heart rate.
  • Infection for you and your baby
  • Uterine rupture. This is when the uterus tears during labor. It happens very rarely.
  • Needing a c-section. If your labor is induced and the medicine doesn’t start your labor, you may need to have a c-section.

Problems from a c-section

  • Breathing and other medical problems for your baby. Babies born by c-section may have more breathing and other medical problems than babies born by vagin*l birth.
  • Needing a c-section in another pregnancy. Once you have a c-section, you may be more likely in future pregnancies to have a c-section. The more c-sections you have, the more problems you and your baby may have, including problems with the placenta.
  • Longer recovery for mom. A c-section is major surgery. It takes longer for you to recover from a c-section than from a vagin*l birth. You can expect to spend 2 to 4 days in the hospital after a c-section. Then you need about 6 to 8 weeks after you go home to fully recover. You also may have complications from the surgery, like infections, bleeding or blood clots. So it's important to stay in touch with your health care provider even after you go home.

What questions can you ask your health care provider about scheduling your baby's birth?

If you’re planning to schedule your baby’s birth, print out this article and take it with you to your next prenatal care checkup. Ask these questions:

If your provider recommends that you have your baby before 39 weeks

  • Is there a problem with my health or the health of my baby that makes birth before 39 weeks necessary?
  • Can I wait to have my baby until I’m closer to 39 weeks?

About inducing labor

  • Why do you need to induce labor?
  • How will you induce my labor?
  • What can I expect when you induce labor?
  • Will inducing labor increase the chance that I’ll need to have a c-section?

About having a c-section

  • Why do I need to have a c-section?
  • What can I expect during and after a c-section?
  • What problems can a c-section cause for me and my baby?
  • Can I have a vagin*l birth in future pregnancies?

See also: 39 weeks infographic

Last reviewed: October, 2018

Why at least 39 weeks is best for your baby (2024)

FAQs

Why at least 39 weeks is best for your baby? ›

The brain, lungs, liver and other important organs get the time they need to develop. The brain alone increases 50% in size in the last five weeks of pregnancy. Babies born before 39 weeks have more health problems than babies born at full term.

What are the benefits of having baby at 39 weeks? ›

Your baby needs 39 weeks in the womb because:

A baby's brain at 35 weeks of pregnancy weighs only two-thirds of what it will weigh at 39 to 40 weeks. They're less likely to have health problems after birth, like breathing, vision and hearing problems. They can gain more weight in the womb.

Is 39 weeks the best time to give birth? ›

Women with low-risk pregnancies may choose labor induction at 39 to 40 weeks. Research shows that inducing labor during this time lowers several risks. Risks include having a stillbirth, having a large baby and getting high blood pressure during pregnancy.

Why do doctors recommend induction at 39 weeks? ›

You might consider induction at 39 weeks to reduce the risk of certain health problems. Healthy women whose labor is induced at 39 weeks may have lower rates of preeclampsia and gestational hypertension than women who do not have induction at 39 weeks.

What week is best for baby to be born? ›

The risk for neonatal complications is lowest in uncomplicated pregnancies delivered between 39 and 41 weeks. To give your baby the healthiest start possible, it's important to remain patient. Elected labor inductions before week 39 can pose short- and long-term health risks for the baby.

Is baby healthy born at 39 weeks? ›

Thirty-nine weeks or more of pregnancy is the new standard of health for babies. Why wait? Electing to deliver before 39 weeks means that your baby misses the benefits of full development that take place in the last weeks of pregnancy.

Are babies' lungs fully developed at 39 weeks? ›

At 36 weeks, baby's lungs are fully formed, and by 40 weeks, your baby has about 150 million alveoli in their lungs, ready to take over the job of breathing on their own once they're born.

What's the most common week to give birth? ›

The researchers also found that:
  • 10% gave birth by 38 weeks and 5 days after the LMP.
  • 25% gave birth by 39 weeks and 5 days after the LMP.
  • 50% gave birth by 40 weeks and 5 days after the LMP.
  • 75% gave birth by 41 weeks and 2 days after the LMP.
  • 90% gave birth by 44 weeks and zero days after the LMP.

Is it better to get induced or wait? ›

Nature is not perfect. However, when it comes to babies and birth, unless there is a clear medical indication that induction of labor will do more good than harm, nature beats science hands down. For both mothers and babies, it is safe and wise to wait patiently until labor begins on its own.

Does your body or the baby decide when labor starts? ›

Researchers now believe that when a baby is ready for life outside his mother's uterus, his body releases a tiny amount of a substance that signals the mother's hormones to begin labor (Condon, Jeyasuria, Faust, & Mendelson, 2004). In most cases, your labor will begin only when both your body and your baby are ready.

What is the healthiest week to deliver a baby? ›

Babies who are born after 34 weeks gestation have the same long-term health outcomes as babies who are delivered at full term (40 weeks). This means that if your baby is born when they are 34 weeks old, they have the same chances of being healthy as any other baby that wasn't born prematurely.

How to tell if baby will come early? ›

If you have any of these signs or symptoms before your 37th week of pregnancy, you may be experiencing preterm labor: Change in your vagin*l discharge (watery, mucus or bloody) or more vagin*l discharge than usual. Pressure in your pelvis or lower belly, like your baby is pushing down. Constant low, dull backache.

What is the most common time of day to go into labor? ›

Most spontaneous births take place between 1:00 and 6.59am with a peak around 4am and a trough in the afternoon, according to UK researchers. Their study has found that the time and day that women give birth can vary significantly depending on how labour starts and the mode of giving birth.

What do babies do in the womb at 39 weeks? ›

In the last weeks, some time before birth, the baby's head should move down into your pelvis. When your baby's head moves down like this, it's said to be "engaged". When this happens, you may notice your bump seems to move down a little.

Is an overdue baby healthy? ›

Many will let pregnant women go up to two weeks over. After 42 weeks, however, the baby's health might be at risk. A very small number of babies die unexpectedly if they are still in the womb beyond 42 weeks of pregnancy. It is unclear why the risks of a death of the baby rise as the weeks go by.

Should I have a baby at 39? ›

Babies born to older mothers have a higher risk of certain chromosomal conditions, such as Down syndrome. The risk of pregnancy loss is higher. The risk of miscarriage and stillbirth increases with age. This may be because of preexisting medical conditions or because of chromosomal conditions in the baby.

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