Premature Labor

Pregnant woman having a premature labor

Pregnancy is normally a time of happiness and anticipation, but it can also be a time of uncertainty. Many women have concerns about what is happening with their baby and wonder “Is everything okay”? Some women have concerns about going into labor early. Premature labor occurs in about 12% of all pregnancies. However, by knowing the symptoms and avoiding particular risk factors, a woman can reduce her chance of going into labor prematurely.

What is premature labor?

A normal pregnancy lasts about 40 weeks. Occasionally, labor begins prematurely, before the 37th week of pregnancy. This happens because uterine contractions cause the cervix to open earlier than normal. Consequently, the baby is born premature and can be at risk for health problems. Fortunately, research, technology and medicine have helped improve the health of premature babies.

What risk factors place me at a high risk for premature labor?

Although the specific causes of premature labor are not yet known, certain factors may increase a woman’s risk of having premature labor. However, having a specific risk factor does not mean a woman will experience premature labor. A woman might have premature labor for no apparent reason.

If you have any of the following risk factors, it is important to know the symptoms of premature labor and what to do if it occurs:

Women are at greatest risk for premature labor if:

  • They are pregnant with multiples
  • They have had a previous premature birth
  • They have certain uterine or cervical abnormalities

Medical risk factors include:

Lifestyle risks for premature labor include:

  • Little or no prenatal care
  • Smoking
  • Drinking alcohol
  • Using illegal drugs
  • Domestic violence, including physical, sexual or emotional abuse
  • Lack of social support
  • High levels of stress
  • Low income
  • Long working hours with long periods of standing

What are warning signs of premature labor?

It may be possible to prevent a premature birth by knowing the warning signs and calling your health care provider if you think you might be having premature labor.

Warning signs and symptoms of premature labor include:

  • A contraction every 10 minutes or more frequently within one hour (five or more uterine contractions in an hour)
  • Watery fluid leaking from your vagina (this could indicate that your bag of water is broken)
  • Menstrual-like cramps in the lower abdomen that can come and go or be constant
  • Low, dull backache felt below the waistline that may come and go or be constant
  • Pelvic pressure that feels like your baby is pushing down
  • Abdominal cramps that may occur with or without diarrhea
  • Increase or change in vaginal discharge

What does a contraction feel like?

As the muscles of your uterus contract, you will feel your abdomen harden. As the contraction goes away, your uterus becomes soft. Throughout pregnancy, the layers of your uterus will tighten irregularly which are usually not painful. These are known as Braxton-Hicks contractions and are usually irregular and do not open the cervix. If these contractions become regular or more frequent such as one every 10-12 minutes for at least an hour, they may be premature labor contractions which can cause the cervix to open. If this happens, it is important to contact your health care provider as soon as possible.

How can I check for contractions?

While lying down, use your fingertips to feel your uterus tighten and soften. This is called “palpation.” During a contraction your abdomen will feel hard all over, not just in one area. However, as your baby grows you may feel your abdomen become firmer in one area and then become soft again.

What should I do if I think I am experiencing premature labor?

If you you think you are showing signs and symptoms of premature labor call your health care provider immediately.

It is natural to be a bit anxious during this time but by becoming aware of the symptoms and taking the following steps, you can help prevent premature labor:

  • Empty your bladder.
  • Lie down tilted towards your left side; this may Slow down or stop signs and symptoms.
  • Avoid lying flat on your back; this may cause contractions to increase.
  • Drink several glasses of water because dehydration can cause contractions.
  • Monitor contractions for one hour by counting the minutes from the beginning of one contraction to the beginning to the next.

If symptoms worsen or don’t disappear after one hour, call your health care provider again or go to the hospital. When you call your health care provider, be sure to tell them that you are concerned that you might have started premature labor. The only sure way to know if you are in premature labor is by examination of your cervix. If your cervix is opening up, premature labor could be the cause.

What is the treatment to prevent premature labor from starting or continuing?

  • Magnesium Sulfate is a medication given through an IV, which may cause nausea temporarily. A large dose is given initially and then a smaller continuous dose is given for 12-24 hours or more.
  • Corticosteroid is a medication given 24 hours before birth to help accelerate the baby’s lung and brain maturity.
  • Oral medications are sometimes used to decrease the frequency of contractions, and may make women feel better.

What impact does premature labor have on my pregnancy?

The longer your baby is in the womb, the better the chance he or she will be healthy. Babies who are born prematurely are at higher risk of brain and other neurological complications, as well as breathing and digestive problems. Some premature babies grow up with a developmental delay and/or have learning difficulties in school. The earlier in pregnancy a baby is born, the more health problems are likely to develop.

Premature labor does not always result in premature delivery. Some women with premature labor and early dilation of the cervix are put on bed rest until the pregnancy progresses. Most babies born prior to 24 weeks have little chance of survival. Only about 50% will survive and the other 50% may die or have permanent problems. However, babies born after 32 weeks have a very high survival rate and usually do not have long term complications. Premature babies born at hospitals with neonatal intensive care units (NICU) have the best results. If you deliver at a hospital that does not have a NICU, you might be transferred to a nearby hospital.

Last Updated: 05/2007

Compiled using information from the following sources:

March of Dimes, http://www.marchofdimes.com/

eMedicine, http://www.emedicine.com/

William’s Obstetrics Twenty-Second Ed. Cunningham, F. Gary, et al, Ch. 36.