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Premature Infant – Causes, Symptoms & Treatment

A premature infant is a baby born before 37 completed weeks of pregnancy. Preterm births often require specialized neonatal intensive care.

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Things worth knowing about "Premature infant"

A premature infant is a baby born before 37 completed weeks of pregnancy. Preterm births often require specialized neonatal intensive care.

What is a Premature Infant?

A premature infant (also called a preterm infant or preemie) is a baby born before the completion of 37 weeks of gestation. A full-term pregnancy lasts approximately 40 weeks. The earlier a baby is born, the less mature its organ systems are, and the greater its need for specialized medical care.

Premature births are classified by gestational age at delivery:

Late preterm: 34 to 36 weeks of gestation
Moderately preterm: 32 to 33 weeks of gestation
Very preterm: 28 to 31 weeks of gestation
Extremely preterm: before 28 weeks of gestation

Causes of Preterm Birth

Preterm birth can result from a variety of maternal and fetal factors:

Infections: Bacterial infections of the genital tract (e.g., bacterial vaginosis) are among the most common triggers.
Multiple pregnancies: Carrying twins, triplets, or more significantly increases the risk.
Cervical insufficiency: Premature shortening or opening of the cervix.
Placental complications: Placental abruption or placenta praevia.
Maternal health conditions: Preeclampsia, diabetes, high blood pressure, or thyroid disease.
Lifestyle and social factors: Smoking, alcohol use, chronic stress, inadequate prenatal care, and low socioeconomic status.
Previous preterm birth: A prior preterm delivery substantially increases the risk in subsequent pregnancies.

Symptoms and Clinical Features

Premature infants display characteristic physical features reflecting their developmental immaturity:

Low birth weight (often below 2,500 g)
Thin, reddish skin with visible blood vessels
Little subcutaneous body fat
Immature lungs (respiratory distress syndrome)
Weak sucking and swallowing reflexes
Difficulty regulating body temperature, blood sugar, and heart rate

Diagnosis

The diagnosis of prematurity is based on gestational age, determined either by the date of the mother's last menstrual period or by early ultrasound. After birth, the following assessments are routinely performed:

Determination of gestational maturity using the Ballard Score or similar tools
Blood tests (blood glucose, complete blood count, inflammatory markers)
Cranial ultrasound to detect intraventricular hemorrhage
Monitoring of lung function and blood oxygen saturation

Treatment and Care

Depending on gestational age, premature infants are cared for in a Neonatal Intensive Care Unit (NICU) or a specialized preterm infant ward. Treatment includes:

Temperature regulation: Incubators maintain a stable body temperature.
Respiratory support: Ranging from supplemental oxygen and CPAP to mechanical ventilation, depending on lung maturity.
Nutrition: Initially delivered intravenously (parenteral nutrition), then via nasogastric tube or breastfeeding.
Surfactant therapy: In cases of lung immaturity, surfactant is administered directly into the lungs to improve respiratory function.
Medication: Depending on complications, treatment may include antibiotics, caffeine to stimulate breathing, or ibuprofen for a patent ductus arteriosus.
Kangaroo care: Skin-to-skin contact between the parent and infant promotes physiological stability, bonding, and successful breastfeeding.

Possible Complications

Preterm birth can be associated with a range of short- and long-term complications:

Respiratory distress syndrome (RDS): Caused by insufficient surfactant, leading to collapse of the lung alveoli.
Intraventricular hemorrhage (IVH): Bleeding in the brain, particularly common in extremely preterm infants.
Necrotizing enterocolitis (NEC): Severe intestinal inflammation that may require emergency surgery.
Retinopathy of prematurity (ROP): Damage to the retina related to oxygen therapy.
Developmental delays: Language, motor, or cognitive difficulties in childhood.

Prognosis and Follow-up Care

The prognosis for a premature infant depends strongly on gestational age and birth weight. Late preterm infants (from 34 weeks onward) generally have an excellent outlook. Extremely preterm infants (below 28 weeks) require intensive, long-term follow-up by pediatric specialists. Regular developmental assessments, early intervention programs, and family support are key components of ongoing care.

References

World Health Organization (WHO): Born Too Soon: The Global Action Report on Preterm Birth. WHO Press, Geneva, 2012.
Stoll BJ et al.: Neonatal Outcomes of Extremely Preterm Infants from the NICHD Neonatal Research Network. Pediatrics, 2010; 126(3): 443-456.
Blencowe H et al.: National, regional, and worldwide estimates of preterm birth rates in the year 2010 with time trends since 1990 for selected countries. The Lancet, 2012; 379(9832): 2162-2172.

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