Everything You Need to Know About Preterm Labor

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By Babylist Team | Updated on Sep 12, 2023
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Being pregnant is an exciting time, filled with anticipation and happiness. But it’s also completely normal for pregnant women to have lots of questions, and even a few worries along the way. Like “What if my baby comes early?”

Although the odds are in your favor that this isn’t something you’ll have to deal with—according to the American Pregnancy Association 1 , premature labor occurs in about 12% of all pregnancies—being knowledgeable about preterm labor can have a major upside. Knowing the risks, signs and symptoms can be key in recognizing and minimizing early labor’s impact.

What Is Preterm Labor?

While a normal pregnancy lasts about 40 weeks, sometimes babies have their own plans. The Mayo Clinic 2 defines preterm labor as when labor begins early, between 20 weeks pregnant and 37 weeks pregnant. It’s important to note that the term “labor” is defined not just as sporadic contractions—like Braxton Hicks contractions, which can be a normal part of pregnancy, especially in the weeks leading up to delivery—but as regular contractions that cause changes to the cervix such as effacement (thinning out) or dilation (opening up).

Preterm labor can lead to premature birth, which is when a baby is born before 37 weeks of pregnancy. Although babies born prematurely do face more health concerns than those born full-term, not all preterm labor leads to premature deliveries. (More on that later.) And baby’s gestational age plays a big role in things too (a baby born before 34 weeks of pregnancy faces more risks than one born between 34 and 37 weeks).

“Preterm labor specifically refers to when the body is preparing to give birth to the baby too early,” says Al Bradlea, Dona-certified doula and lactation consultant. “But that doesn’t mean that the baby is actually born too early.”

There are treatment options for preterm labor, as well as ways to minimize the risks (more on that below).

What Causes Preterm Labor?

It’s unclear what exactly causes spontaneous premature labor, but there are certain factors that increase your risk. The Mayo Clinic cites the three biggest ones as:

  • Having a premature baby in the past or a family history of premature birth

  • Being pregnant with multiples

  • Having uterine or cervical abnormalities

Other risk factors for premature labor include:

  • Being underweight or overweight at the time you got pregnant

  • Health conditions such as: diabetes, preeclampsia, hypertension (high blood pressure), a connective tissue disorder, ICP (a common liver condition that happens during pregnancy) or thrombophilias (a blood clotting condition)

  • Being pregnant with a baby with certain birth defects

  • Being older than 35 years of age

  • Experiencing vaginal bleeding in the second or third trimester

  • Being pregnant after in vitro fertilization (IVF)

  • A prior pregnancy less than 6-9 months ago

  • Smoking, drinking or using drugs

  • Little or no prenatal care

  • High stress levels

Keep in mind that even without any of the above risk factors, some women still experience premature labor.

Signs of Preterm Labor

It’s pretty common to feel some strange symptoms throughout your 40 weeks of pregnancy. And even though worrying about preterm labor shouldn’t be on the top of your to-do list, it is important to learn about some of the warning signs so you’ll know what to look out for—and be able to possibly prevent it.

According to UCSF Health 3 , signs of preterm labor include:

  • Five or more uterine contractions per hour

  • A gush or more-than-normal amount of watery fluid leaking from your vagina

  • An increase or change in vaginal discharge

  • Strong pelvic pressure (the sensation that baby is pushing down)

  • Menstrual-like cramps in your lower abdomen, either constant or intermittent, or a constant, dull backache

  • Abdominal cramps

When should you see the doctor?

As premature labor can sometimes be stopped, it’s important that you contact your healthcare provider immediately if you’re having any of the signs and symptoms listed above. Even if you’re unsure of what you’re experiencing, it’s always best to reach out to your doctor as soon as possible.

Treatment for Preterm Labor

When you arrive either at your doctor’s office or at the hospital, your provider may do a pelvic exam or a transvaginal ultrasound to check if your cervix has begun to dilate. You also may be hooked up to a monitor to check the strength and regularity of your contractions.

If you are in premature labor, there are several treatment options available, according to Stanford Children’s Health 4 :

  • Antenatal corticosteroids, which work to mature baby’s lungs in case of an early delivery

  • Antibiotics to treat infection

  • Tocolytics to stop or slow contractions

“[These treatments] give the baby a better chance of thriving when they’re born early,” explains Bradlea. “We want baby to be as ready as possible when delivery happens.”

Other treatments include progesterone, bed rest or a cerclage 5 , which is a stitch in your cervix to help keep it closed.

Can You Prevent Preterm Labor?

When it comes to preventing preterm labor, there are several things you can do to reduce your risks. The Minnesota Department of Health 6 recommends the following:

  • Maintaining a healthy weight

  • Trying to manage stress

  • Avoiding drugs and alcohol

  • Getting regular prenatal care in order to stay on top of any health conditions that may develop throughout your pregnancy

“If you’re a smoker or you use other drugs, you need to be brave and talk about it with your doctor,” Bradlea says. “They need to know about it so they can monitor you more closely.”

There’s help available too. “Your doctor can also connect you to other resources or outpatient programs to help manage all the other risks those substances come alongside with,” Bradlea says.

Preterm labor can be an overwhelming thing to think about when you’re pregnant, but knowing the signs, risks and prevention and treatment options can help you feel a little more in control.

Pregnant woman holding her stomach on a bed with a plant in the background

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Your privacy is important to us. By subscribing you agree to our Privacy Policy and Terms & Conditions.

Expectful uses only high-quality sources, including academic research institutions, medical associations, and subject matter experts.

  1. March of Dimes, eMedicine, William’s Obstetrics Twenty-Second Ed. Cunningham, F. Gary, et al, Ch. 36."Premature Labor"https://americanpregnancy.org/healthy-pregnancy/labor-and-birth/premature-labor/.

  2. Mayo Clinic Staff"Preterm labor"https://www.mayoclinic.org/diseases-conditions/preterm-labor/symptoms-causes/syc-20376842.

  3. "Recognizing Premature Labor"https://www.ucsfhealth.org/education/recognizing-premature-labor.

  4. "Preterm Labor"https://www.stanfordchildrens.org/en/topic/default?id=preterm-labor-90-P02497.

  5. William’s Obstetrics Twenty-Second Ed. Cunningham, F. Gary, et al Danforth/s Obstetrics and Gynecology Ninth Ed. Scott, James R., et al"Cervical Cerclage"https://americanpregnancy.org/healthy-pregnancy/pregnancy-complications/cervical-cerclage/.

  6. "Prevention of Premature Births"May 10, 2022https://www.health.state.mn.us/people/womeninfants/prematurity/prevention.html.


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Updated on Sep 12, 2023

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Everything You Need to Know About Preterm Labor

 Babylist Team Profile Photo
By Babylist Team | Updated on Sep 12, 2023
Image for article Everything You Need to Know About Preterm Labor

Being pregnant is an exciting time, filled with anticipation and happiness. But it’s also completely normal for pregnant women to have lots of questions, and even a few worries along the way. Like “What if my baby comes early?”

Although the odds are in your favor that this isn’t something you’ll have to deal with—according to the American Pregnancy Association 1 , premature labor occurs in about 12% of all pregnancies—being knowledgeable about preterm labor can have a major upside. Knowing the risks, signs and symptoms can be key in recognizing and minimizing early labor’s impact.

What Is Preterm Labor?

While a normal pregnancy lasts about 40 weeks, sometimes babies have their own plans. The Mayo Clinic 2 defines preterm labor as when labor begins early, between 20 weeks pregnant and 37 weeks pregnant. It’s important to note that the term “labor” is defined not just as sporadic contractions—like Braxton Hicks contractions, which can be a normal part of pregnancy, especially in the weeks leading up to delivery—but as regular contractions that cause changes to the cervix such as effacement (thinning out) or dilation (opening up).

Preterm labor can lead to premature birth, which is when a baby is born before 37 weeks of pregnancy. Although babies born prematurely do face more health concerns than those born full-term, not all preterm labor leads to premature deliveries. (More on that later.) And baby’s gestational age plays a big role in things too (a baby born before 34 weeks of pregnancy faces more risks than one born between 34 and 37 weeks).

“Preterm labor specifically refers to when the body is preparing to give birth to the baby too early,” says Al Bradlea, Dona-certified doula and lactation consultant. “But that doesn’t mean that the baby is actually born too early.”

There are treatment options for preterm labor, as well as ways to minimize the risks (more on that below).

What Causes Preterm Labor?

It’s unclear what exactly causes spontaneous premature labor, but there are certain factors that increase your risk. The Mayo Clinic cites the three biggest ones as:

  • Having a premature baby in the past or a family history of premature birth

  • Being pregnant with multiples

  • Having uterine or cervical abnormalities

Other risk factors for premature labor include:

  • Being underweight or overweight at the time you got pregnant

  • Health conditions such as: diabetes, preeclampsia, hypertension (high blood pressure), a connective tissue disorder, ICP (a common liver condition that happens during pregnancy) or thrombophilias (a blood clotting condition)

  • Being pregnant with a baby with certain birth defects

  • Being older than 35 years of age

  • Experiencing vaginal bleeding in the second or third trimester

  • Being pregnant after in vitro fertilization (IVF)

  • A prior pregnancy less than 6-9 months ago

  • Smoking, drinking or using drugs

  • Little or no prenatal care

  • High stress levels

Keep in mind that even without any of the above risk factors, some women still experience premature labor.

Signs of Preterm Labor

It’s pretty common to feel some strange symptoms throughout your 40 weeks of pregnancy. And even though worrying about preterm labor shouldn’t be on the top of your to-do list, it is important to learn about some of the warning signs so you’ll know what to look out for—and be able to possibly prevent it.

According to UCSF Health 3 , signs of preterm labor include:

  • Five or more uterine contractions per hour

  • A gush or more-than-normal amount of watery fluid leaking from your vagina

  • An increase or change in vaginal discharge

  • Strong pelvic pressure (the sensation that baby is pushing down)

  • Menstrual-like cramps in your lower abdomen, either constant or intermittent, or a constant, dull backache

  • Abdominal cramps

When should you see the doctor?

As premature labor can sometimes be stopped, it’s important that you contact your healthcare provider immediately if you’re having any of the signs and symptoms listed above. Even if you’re unsure of what you’re experiencing, it’s always best to reach out to your doctor as soon as possible.

Treatment for Preterm Labor

When you arrive either at your doctor’s office or at the hospital, your provider may do a pelvic exam or a transvaginal ultrasound to check if your cervix has begun to dilate. You also may be hooked up to a monitor to check the strength and regularity of your contractions.

If you are in premature labor, there are several treatment options available, according to Stanford Children’s Health 4 :

  • Antenatal corticosteroids, which work to mature baby’s lungs in case of an early delivery

  • Antibiotics to treat infection

  • Tocolytics to stop or slow contractions

“[These treatments] give the baby a better chance of thriving when they’re born early,” explains Bradlea. “We want baby to be as ready as possible when delivery happens.”

Other treatments include progesterone, bed rest or a cerclage 5 , which is a stitch in your cervix to help keep it closed.

Can You Prevent Preterm Labor?

When it comes to preventing preterm labor, there are several things you can do to reduce your risks. The Minnesota Department of Health 6 recommends the following:

  • Maintaining a healthy weight

  • Trying to manage stress

  • Avoiding drugs and alcohol

  • Getting regular prenatal care in order to stay on top of any health conditions that may develop throughout your pregnancy

“If you’re a smoker or you use other drugs, you need to be brave and talk about it with your doctor,” Bradlea says. “They need to know about it so they can monitor you more closely.”

There’s help available too. “Your doctor can also connect you to other resources or outpatient programs to help manage all the other risks those substances come alongside with,” Bradlea says.

Preterm labor can be an overwhelming thing to think about when you’re pregnant, but knowing the signs, risks and prevention and treatment options can help you feel a little more in control.

Pregnant woman holding her stomach on a bed with a plant in the background

Want evidence-based health & wellness advice for fertility, pregnancy, and postpartum delivered to your inbox?

Your privacy is important to us. By subscribing you agree to our Privacy Policy and Terms & Conditions.

Expectful uses only high-quality sources, including academic research institutions, medical associations, and subject matter experts.

  1. March of Dimes, eMedicine, William’s Obstetrics Twenty-Second Ed. Cunningham, F. Gary, et al, Ch. 36."Premature Labor"https://americanpregnancy.org/healthy-pregnancy/labor-and-birth/premature-labor/.

  2. Mayo Clinic Staff"Preterm labor"https://www.mayoclinic.org/diseases-conditions/preterm-labor/symptoms-causes/syc-20376842.

  3. "Recognizing Premature Labor"https://www.ucsfhealth.org/education/recognizing-premature-labor.

  4. "Preterm Labor"https://www.stanfordchildrens.org/en/topic/default?id=preterm-labor-90-P02497.

  5. William’s Obstetrics Twenty-Second Ed. Cunningham, F. Gary, et al Danforth/s Obstetrics and Gynecology Ninth Ed. Scott, James R., et al"Cervical Cerclage"https://americanpregnancy.org/healthy-pregnancy/pregnancy-complications/cervical-cerclage/.

  6. "Prevention of Premature Births"May 10, 2022https://www.health.state.mn.us/people/womeninfants/prematurity/prevention.html.


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