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Low Birth Weight – Causes, Symptoms and Treatment

Low birth weight refers to a birth weight below the 10th percentile for gestational age, indicating insufficient nutrient and oxygen supply to the unborn child.

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Things worth knowing about "Low Birth Weight"

Low birth weight refers to a birth weight below the 10th percentile for gestational age, indicating insufficient nutrient and oxygen supply to the unborn child.

What Is Low Birth Weight?

Low birth weight -- more specifically referred to as Small for Gestational Age (SGA) -- describes a birth weight that falls below the 10th percentile for the corresponding gestational age. This means the newborn weighs less than expected compared to other babies born at the same stage of pregnancy. It is a clinical indicator that the baby did not receive adequate nutrition and oxygen during intrauterine development.

Causes

Low birth weight can result from a range of maternal, placental, and fetal factors:

Maternal Causes

Malnutrition during pregnancy
Chronic conditions such as hypertension, diabetes mellitus, or kidney disease
Smoking, alcohol use, or drug use during pregnancy
Preeclampsia (pregnancy-related high blood pressure with organ involvement)
Severe maternal infections
Very young maternal age (under 16) or advanced maternal age

Placental Causes

Placental insufficiency: reduced ability of the placenta to support fetal growth
Abnormal placentation or placental location

Fetal Causes

Chromosomal abnormalities (e.g., Trisomy 18 or 21)
Congenital malformations
Intrauterine infections (e.g., rubella, cytomegalovirus)
Multiple pregnancies (twins, triplets)

Signs and Characteristics

Newborns with low birth weight typically display the following clinical features:

Low body weight relative to body length
Reduced subcutaneous fat (little padding under the skin)
Loose, wrinkled skin
Visible ribs and bony prominences
Risk of hypoglycemia (low blood sugar) shortly after birth
Increased susceptibility to hypothermia (low body temperature)

Diagnosis

Diagnosis is made using standardized growth charts that plot birth weight, body length, and head circumference against gestational age. Prenatal detection of growth restriction is possible through:

Ultrasound measurements of fetal head circumference, abdominal circumference, and femur length
Doppler ultrasound to assess blood flow in the umbilical cord and maternal vessels
Regular fundal height measurements and maternal weight monitoring

After birth, the newborn weight is compared against standard percentile charts. A weight below the 10th percentile confirms an SGA classification.

Complications and Risks

SGA newborns face both short-term and long-term health risks:

Short-Term Risks

Hypoglycemia in the first hours of life
Polycythemia (elevated red blood cell count)
Hypothermia
Respiratory distress syndrome

Long-Term Risks

Increased risk of cardiovascular disease in adulthood
Elevated risk of type 2 diabetes
Delayed cognitive and motor development
Reduced growth potential (short stature)

Treatment and Care

Management depends on the underlying cause and severity of growth restriction:

Prenatal Management

Frequent ultrasound and Doppler monitoring
Optimizing maternal nutrition and treating underlying conditions
Early delivery if fetal well-being can no longer be guaranteed

Postnatal Care

Early nutritional support (breastfeeding or tube feeding)
Monitoring blood glucose levels
Maintaining body temperature (e.g., incubator care)
Growth hormone therapy in cases of persistent growth failure

Prognosis

The outlook largely depends on the cause, severity, and timeliness of medical intervention. Many SGA children demonstrate catch-up growth within the first two years of life, reaching a normal weight and height. Children who do not achieve adequate catch-up growth may require long-term pediatric follow-up and, in some cases, hormonal treatment.

References

World Health Organization (WHO): Born Too Soon: The Global Action Report on Preterm Birth. WHO Press, Geneva, 2012.
Lausman A, Kingdom J: Intrauterine growth restriction: Screening, diagnosis, and management. Journal of Obstetrics and Gynaecology Canada, 2013; 35(8): 741-748.
Sharma D, Shastri S, Sharma P: Intrauterine Growth Restriction: Antenatal and Postnatal Aspects. Clinical Medicine Insights: Pediatrics, 2016; 10: 67-83.

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