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A premature birth is a birth that takes place more than three weeks before the baby's estimated due date. In other words, a premature birth is one that occurs before the start of the 37th week of pregnancy.
Premature babies, especially those born very early, often have complicated medical problems. Typically, complications of prematurity vary. But the earlier your baby is born, the higher the risk of complications.
Depending on how early a baby is born, he or she may be:
Late preterm, born between 34 and 36 completed weeks of pregnancy
Moderately preterm, born between 32 and 34 weeks of pregnancy
Very preterm, born at less than 32 weeks of pregnancy
Extremely preterm, born at or before 25 weeks of pregnancy
Most premature births occur in the late preterm stage.
Your baby may have very mild symptoms of premature birth, or may have more-obvious complications.
Some signs of prematurity include the following:
Small size, with a disproportionately large head
Sharper looking, less rounded features than a full-term baby's features, due to a lack of fat stores
Fine hair (lanugo) covering much of the body
Low body temperature, especially immediately after birth in the delivery room, due to a lack of stored body fat
Labored breathing or respiratory distress
Lack of reflexes for sucking and swallowing, leading to feeding difficulties
The following tables show the median birth weight, length and head circumference of premature babies at different gestational ages for each sex.
Weight, length and head circumference by gestational age for boys
7 lbs., 15 oz.
20 in. (51 cm)
13.8 in. (35 cm)
5 lbs., 8 oz.
18.1 in. (46 cm)
12.6 in. (32 cm)
3 lbs., 15.5 oz.
16.5 in. (42 cm)
11.6 in. (29.5 cm)
2 lbs., 6.8 oz.
14.4 in. (36.5 cm)
10.2 in. (26 cm)
1 lb., 6.9 oz.
12.2 in. (31 cm)
8.7 in. (22 cm)
Weight, length and head circumference by gestational age for girls
7 lbs., 7.9 oz.
20 in. (51 cm)
13.8 in. (35 cm)
5 lbs., 4.7 oz.
17.7 in. (45 cm)
12.4 in. (31.5 cm)
3 lbs., 12 oz.
16.5 in. (42 cm)
11.4 in. (29 cm)
2 lbs., 3.3 oz.
14.1 in. (36 cm)
9.8 in. (25 cm)
1 lb., 5.2 oz.
12.6 in. (32 cm)
8.3 in. (21 cm)
If you deliver a preterm baby, your baby will likely need a longer hospital stay in a special nursery unit at the hospital. Depending on how much care your baby requires, he or she may be admitted to an intermediate care nursery or the neonatal intensive care unit (NICU). Doctors and a specialized team with training in taking care of preterm babies will be available to help care for your baby. Don't hesitate to ask questions.
Your baby may need extra help feeding, and adapting immediately after delivery. Your health care team can help you understand what is needed and what your baby's care plan will be.
Often, the specific cause of premature birth isn't clear. However, there are known risk factors of premature delivery, including:
Having a previous premature birth
Pregnancy with twins, triplets or other multiples
An interval of less than six months between pregnancies
Conceiving through in vitro fertilization
Problems with the uterus, cervix or placenta
Smoking cigarettes or using illicit drugs
Some infections, particularly of the amniotic fluid and lower genital tract
Some chronic conditions, such as high blood pressure and diabetes
Being underweight or overweight before pregnancy
Stressful life events, such as the death of a loved one or domestic violence
Multiple miscarriages or abortions
Physical injury or trauma
For unknown reasons, black women are more likely to experience premature birth than are women of other races. But premature birth can happen to anyone. In fact, many women who have a premature birth have no known risk factors.
While not all premature babies experience complications, being born too early can cause short-term and long-term health problems. Generally, the earlier a baby is born, the higher the risk of complications. Birth weight plays an important role, too.
Some problems may be apparent at birth, while others may not develop until later.
In the first weeks, the complications of premature birth may include:
Breathing problems. A premature baby may have trouble breathing due to an immature respiratory system. If the baby's lungs lack surfactant — a substance that allows the lungs to expand — he or she may develop respiratory distress syndrome because the lungs can't expand and contract normally.
Premature babies may also develop a lung disorder known as bronchopulmonary dysplasia. In addition, some preterm babies may experience prolonged pauses in their breathing, known as apnea.
Heart problems. The most common heart problems premature babies experience are patent ductus arteriosus (PDA) and low blood pressure (hypotension). PDA is a persistent opening between the aorta and pulmonary artery. While this heart defect often closes on its own, left untreated it can lead to a heart murmur, heart failure as well as other complications. Low blood pressure may require adjustments in intravenous fluids, medicines and sometimes blood transfusions.
Brain problems. The earlier a baby is born, the greater the risk of bleeding in the brain, known as an intraventricular hemorrhage. Most hemorrhages are mild and resolve with little short-term impact. But some babies may have larger brain bleeding that causes permanent brain injury.
Temperature control problems. Premature babies can lose body heat rapidly. They don't have the stored body fat of a full-term infant, and they can't generate enough heat to counteract what's lost through the surface of their bodies. If body temperature dips too low, an abnormally low core body temperature (hypothermia) can result.
Hypothermia in a premature baby can lead to breathing problems and low blood sugar levels. In addition, a premature infant may use up all of the energy gained from feedings just to stay warm. That's why smaller premature infants require additional heat from a warmer or an incubator until they're larger and able to maintain body temperature without assistance.
Gastrointestinal problems. Premature infants are more likely to have immature gastrointestinal systems, resulting in complications such as necrotizing enterocolitis (NEC). This potentially serious condition, in which the cells lining the bowel wall are injured, can occur in premature babies after they start feeding. Premature babies who receive only breast milk have a much lower risk of developing NEC.
Blood problems. Premature babies are at risk of blood problems such as anemia and newborn jaundice. Anemia is a common condition in which the body doesn't have enough red blood cells. While all newborns experience a slow drop in red blood cell count during the first months of life, the decrease may be greater in premature babies.
Newborn jaundice is a yellow discoloration in a baby's skin and eyes that occurs because the baby's blood contains excess bilirubin, a yellow-colored substance, from the liver or red blood cells. While there are many causes of jaundice, it is more common in preterm babies.
Metabolism problems. Premature babies often have problems with their metabolism. Some premature babies may develop an abnormally low level of blood sugar (hypoglycemia). This can happen because premature infants typically have smaller stores of stored glucose than do full-term babies. Premature babies also have more difficulty converting their stored glucose into more-usable, active forms of glucose.
Immune system problems. An underdeveloped immune system, common in premature babies, can lead to a higher risk of infection. Infection in a premature baby can quickly spread to the bloodstream, causing sepsis, an infection that spreads to the bloodstream.
In the long term, premature birth may lead to the following complications:
Cerebral palsy. Cerebral palsy is a disorder of movement, muscle tone or posture that can be caused by infection, inadequate blood flow or injury to a newborn's developing brain either early during pregnancy or while the baby is still young and immature.
Impaired learning. Premature babies are more likely to lag behind their full-term counterparts on various developmental milestones. Upon school age, a child who was born prematurely might be more likely to have learning disabilities.
Vision problems. Premature infants may develop retinopathy of prematurity, a disease that occurs when blood vessels swell and overgrow in the light-sensitive layer of nerves at the back of the eye (retina). Sometimes the abnormal retinal vessels gradually scar the retina, pulling it out of position. When the retina is pulled away from the back of the eye, it's called retinal detachment, a condition that, if undetected, can impair vision and cause blindness.
Hearing problems. Premature babies are at increased risk of some degree of hearing loss. All babies will have their hearing checked before going home.
Dental problems. Premature infants who have been critically ill are at increased risk of developing dental problems, such as delayed tooth eruption, tooth discoloration and improperly aligned teeth.
Behavioral and psychological problems. Children who experienced premature birth may be more likely than full-term infants to have certain behavioral or psychological problems, as well as developmental delays.
Chronic health issues. Premature babies are more likely to have chronic health issues — some of which may require hospital care — than are full-term infants. Infections, asthma and feeding problems are more likely to develop or persist. Premature infants are also at increased risk of sudden infant death syndrome (SIDS).
Although the exact cause of preterm birth is often unknown, there are some things that can be done to help women — especially those who have an increased risk — to reduce their risk of preterm birth, including:
Progesterone supplements. Women who have a history of preterm birth, a short cervix or both factors may be able to reduce the risk of preterm birth with progesterone supplementation.
Cervical cerclage. This is a surgical procedure performed during pregnancy in women with a short cervix, or a history of cervical shortening that resulted in a preterm birth.
During this procedure, the cervix is stitched closed with strong sutures that may provide extra support to the uterus. The sutures are removed when it's time to deliver the baby. Ask your doctor if you need to avoid vigorous activity during the remainder of your pregnancy.
After your premature baby is moved to the NICU, he or she may undergo a number of tests. Some are ongoing, while others may be performed only if the NICU staff suspects a particular complication.
Possible tests for your premature baby may include:
Breathing and heart rate monitor. Your baby's breathing and heart rate are monitored on a continuous basis. Blood pressure readings are done frequently, too.
Fluid input and output. The NICU team carefully tracks how much fluid your baby takes in through feedings and intravenous fluids and how much fluid your baby loses through wet or soiled diapers.
Blood tests. Blood samples are collected through a heel stick or a needle inserted into a vein to monitor a number of critical substances, including calcium, glucose and bilirubin levels in your baby's blood. A blood sample may also be analyzed to measure the red blood cell count and check for anemia or assess for an infection.
If your baby's doctor anticipates that several blood samples will be needed, the NICU staff may insert a central umbilical intravenous (IV) line, to avoid having to stick your baby with a needle each time blood is needed.
Echocardiogram. This test is an ultrasound of the heart to check for problems with your baby's heart function. Much like a fetal ultrasound, an electrocardiogram uses sound waves to produce moving images on a display monitor.
Ultrasound scan. Ultrasound scans may be done to check the brain for bleeding or fluid buildup or to examine the abdominal organs for problems in the gastrointestinal tract, liver or kidneys.
Eye exam. An ophthalmologist (eye doctor) may examine your baby's eyes and vision to check for problems with the retina (retinopathy of prematurity).
If your baby develops any complications, other specialized testing may be needed.
The neonatal intensive care unit (NICU) or special care nursery provides round-the-clock care for your premature baby.
Specialized supportive care for your baby may include:
Being placed in an incubator. Your baby will probably stay in an enclosed plastic bassinet (incubator) that's kept warm to help your baby maintain normal body temperature. Later on, NICU staff may show you a particular way to hold your baby — known as "kangaroo" care — with direct skin-to-skin contact.
Monitoring of your baby's vital signs. Sensors may be taped to your baby's body to monitor blood pressure, heart rate, breathing and temperature. A ventilator may be used to help your baby breathe.
Having a feeding tube. At first your baby may receive fluids and nutrients through an intravenous (IV) tube. Breast milk may be given later through a tube passed through your baby's nose and into his or her stomach (nasogastric, or NG, tube). When your baby is strong enough to suck, breast-feeding or bottle-feeding is often possible.
Replenishing fluids. Your baby needs a certain amount of fluids each day, depending upon his or her age and medical conditions. The NICU team will closely monitor fluids, sodium and potassium levels to make sure that your baby's fluid levels stay on target. If fluids are needed, they'll be delivered through an IV line.
Spending time under bilirubin lights. To treat infant jaundice, your baby may be placed under a set of lights — known as bilirubin lights — for a period of time. The lights help your baby's system break down excess bilirubin, which builds up because the liver can't process it all. While under the bilirubin lights, your baby will wear a protective eye mask to rest more comfortably.
Receiving a blood transfusion. Your preterm baby may need a blood transfusion to raise blood volume — especially if your baby has had several blood samples drawn for various tests.
Medications may be given to your baby to promote maturing and to stimulate normal functioning of the lungs, heart and circulation. Depending on your baby's condition, medication may include:
Surfactant, a medication used to treat respiratory distress syndrome
Fine-mist (aerosolized) or IV medication to strengthen breathing and heart rate
Antibiotics if infection is present or if there's a risk of possible infection
Medicines that increase urine output (diuretics) to manage excess fluid
An injection of medication into the eye to stop the growth of new blood vessels that could cause retinopathy of prematurity
Medicine that helps close the heart defect known as patent ductus arteriosus
Sometimes surgery is necessary to treat a number of conditions associated with prematurity. Talk with your baby's health care team to understand which complications may require surgery, and learn about the type of surgery that might be necessary to treat them.
Taking your baby home
Your baby is ready to go home when he or she:
Can breathe without support
Can maintain a stable body temperature
Can breast- or bottle-feed
Is gaining weight steadily
Is free of infection
In some cases, a child may be allowed to go home before meeting one of these requirements — as long as the baby's medical team and family create and agree on a plan for home care and monitoring.
Your baby's health care team will help you learn how to care for your baby at home. Before dismissal from the hospital, your baby's nurse or a hospital discharge planner may ask you about:
Other children in the household
Adult relatives and friends who may assist you in caring for your baby
Primary pediatric care
Lifestyle and home remedies
When it's time to bring your baby home, you might feel relieved, excited — and anxious. Take time to consider ways to prepare for life at home with your baby after you've left the hospital:
Understand how to care for your baby. Before you leave the hospital, take a course in infant CPR. Ask your baby's medical team any questions you might have and take notes.
Make sure you're comfortable caring for your baby, especially if you'll need to administer medications, use special monitors, or give your baby supplemental oxygen or other treatments. Discuss symptoms — such as infant breathing or feeding problems — that might necessitate a call to your baby's care provider.
Discuss feedings. Ask the medical team about your baby's need for supplementation in the form of breast milk fortifiers or preterm infant formula. Keep in mind that premature babies usually eat less and may need to be fed more often than full-term babies. Find out how much and how often your baby should be eating.
Protect your baby's health. Premature babies are more susceptible to serious infections than are other newborns. Try to minimize your baby's exposure to crowded places, and make sure everyone who comes into contact with your baby washes his or her hands first. Ask people who are ill to postpone their visit until they are well.
Because preemies are especially at risk of a serious infection of the lungs and respiratory tract (respiratory syncytial virus, or RSV), your baby's doctor might recommend a preventive medication called palivizumab (Synagis), which helps protect your baby from this serious infection.
Follow a recommended schedule for checkups. Discuss your baby's need for future appointments with your baby's care provider and any specialists. Your preterm baby may initially need to see his or her care provider every week or two to have his or her growth, medical needs and care monitored.
Stay on top of vaccinations. While it's recommended that immunizations be given to medically stable premature babies according to their chronological age, delays in the immunization schedule are common. Work with your baby's care provider to stay on top of your baby's vaccinations.
You may also protect your preterm infant by ensuring that others in the home are up to date on their immunizations, including influenza. Pregnant women, family members and adult caregivers should also check with their doctors to be sure they're up to date on their whooping cough (pertussis) vaccine.
Monitor for developmental delays. Your baby's care provider may also monitor your baby for developmental delays and disabilities in the coming months. Babies who are identified as at risk may receive further evaluation and be referred to early intervention services. Eligibility for such programs varies by state.
Coping and support
Caring for a premature baby can be physically and emotionally exhausting. You may be anxious about your baby's health and the long-term effects of premature birth. You may feel angry, guilty or overwhelmed.
Some of these suggestions may help during this difficult time:
Learn everything you can about your baby's condition. In addition to talking to your baby's doctor and other care providers, ask for informational pamphlets and recommendations for good books and reliable websites for more information about taking care of your preterm baby.
Take care of yourself. Get as much rest as you can and eat healthy foods. You'll feel stronger and better able to care for your baby.
Establish your milk supply. Use a breast pump until your baby is able to breast-feed. Ask the hospital staff for help — they can show you how to use a breast pump and find the supplies you'll need to store milk.
Accept help from others. Allow friends and family to help you. They can care for your other children, prepare food, clean the house or run errands. This helps you save your energy for your baby.
Keep a journal. Record the details of your baby's progress as well as your own thoughts and feelings. You may want to include pictures of your baby so that you can see how much he or she changes from week to week.
Seek good listeners for support. Talk to your partner or spouse, friends, family, or your baby's caregivers. The NICU social worker often can be very helpful. If you're interested, your baby's caregivers may be able to suggest a support group in your area. Many parents find it particularly helpful to talk to other parents who are caring for a preterm infant.
Caring for a baby is a great challenge. Take it one day at a time. Despite the worries and setbacks, celebrate the surprising resilience and strength of your preemie, and cherish the time you can spend getting to know your son or daughter.
Preparing for an appointment
As the parent of a premature baby in the neonatal intensive care unit (NICU), you'll interact, on an ongoing basis, with many care providers for your baby. Members of the NICU team caring for your infant may include:
Neonatal nurse — A registered nurse who has special training in caring for premature and high-risk newborns
Neonatal nurse practitioner — An experienced neonatal nurse who has completed additional training to assist neonatologists in caring for newborns
Pediatrician — A doctor who specializes in treating children from birth through adolescence
Neonatologist — A pediatrician who specializes in the diagnosis and treatment of newborn health problems
Pediatric resident — A doctor who is receiving specialized training in treating children
Respiratory therapist — A respiratory care practitioner who assesses respiratory problems in newborns and manages respiratory equipment
Pediatric surgeon — A surgeon who specializes in performing surgery for newborns and children
Pediatric social worker — A professional able to assist in finding various services that might be useful during and after your baby's hospital stay.
Besides these health professionals, you also are an important part of the care provided for your baby. Ideally, you'll work in collaboration with your baby's care providers, eventually learning how to hold, feed and care for your baby.
What you can do
Uncertainty can be frightening — as can seeing monitors and other types of equipment in the NICU. Ask questions about your baby's condition or write them down and seek answers when you're ready. For instance, you may want to ask:
How is my baby's condition? Has anything changed?
How does this equipment help my baby?
Why are you giving my baby medication?
What types of tests does my baby need?
When can I hold my baby? Will you show me how?
How long will my baby have to continue tube feedings?
When can I try to breast- or bottle-feed my baby?
When will my baby be able to focus his or her eyes?
Who should I contact if I have questions about my baby's care?
Can I bring in a blanket or family photos to personalize my baby's incubator?
What can I do to help care for my baby while he or she is in the NICU?
When will my baby be able to come home?
What do I need to know about caring for my baby once we're home?
How often do we need to come back for follow-up visits after discharge?
During your baby's time in the NICU, don't hesitate to ask the NICU staff how you can become more involved in your baby's care. Being hands-on with your baby can give you confidence as a new parent, as well as make the transition home a little easier.