Low Birth Weight and Prematurity
Low Birth Weight and Prematurity
Low birth weight (LBW) means birth weight below 2,500 g regardless of gestational age. Preterm means birth before 37 completed weeks. A baby may be both preterm and LBW, but a term infant may be LBW because of fetal growth restriction.
Small baby priorities—WARM: Warmth, Airway and breathing, Responsive feeding/glucose care, Monitoring for infection and complications.
Classification
| Measure | Classification |
|---|---|
| Birth weight | LBW <2,500 g; very LBW <1,500 g; extremely LBW <1,000 g |
| Gestation | Extremely preterm <28 weeks; very preterm 28–<32 weeks; moderate/late preterm 32–<37 weeks |
| Size for gestation | Appropriate, small or large for gestational age using a suitable growth chart |
Causes and Risk Factors
- Previous preterm birth, multiple pregnancy, short cervix, uterine/cervical abnormality or premature rupture of membranes.
- Maternal hypertension, diabetes, anaemia, malaria, HIV or other infection, undernutrition, tobacco/alcohol/drugs and inadequate antenatal care.
- Placental insufficiency, antepartum haemorrhage, fetal anomaly and medically indicated early birth.
- Adolescent or advanced maternal age, heavy work, psychosocial stress and poverty-related barriers to care.
Why the Preterm Baby is Vulnerable
Immature lungs lack surfactant; the brain has fragile vessels; thin skin and little brown fat cause heat loss; glycogen and fat stores are limited; suck–swallow–breathe coordination is weak; kidneys, gut, liver, immunity and retinal vessels are immature. The result is respiratory distress, apnoea, hypothermia, hypoglycaemia, sepsis, jaundice, feeding intolerance, necrotising enterocolitis (NEC), intraventricular haemorrhage and retinopathy of prematurity.
Recognition and Assessment
- Record accurate weight, gestational age, length, head circumference and plot growth.
- Assess breathing, saturation, temperature, colour, perfusion, tone, activity, congenital anomalies and birth trauma.
- Look for thin shiny skin, abundant lanugo, soft ear cartilage, few plantar creases, small breast tissue and immature genitalia.
- Check glucose in at-risk infants and repeat according to protocol; evaluate feeding ability and maternal lactation.
- Screen for sepsis risk, jaundice and anaemia; investigate blood count/culture, bilirubin, blood gas, electrolytes, imaging and other tests according to signs and gestation.
Immediate and Ongoing Management
- Stabilise: follow neonatal resuscitation principles, position airway, support ventilation and oxygenation, and avoid both hypoxia and excessive oxygen.
- Prevent heat loss: warm room, dry and cover, hat, plastic wrap for very preterm infants during initial stabilisation where protocol recommends, warm transport, incubator/radiant warmer or KMC.
- Kangaroo mother care: begin prolonged skin-to-skin contact as soon as possible, including before full stability when trained staff can safely monitor and provide needed support. Secure baby upright with head turned and neck slightly extended; keep airway visible.
- Respiratory care: monitor distress and apnoea; use CPAP, caffeine and surfactant only under neonatal protocol and trained supervision. Titrate oxygen to prescribed saturation targets.
- Glucose: initiate early breast-milk feeding when safe; treat low glucose promptly with feeding or IV dextrose according to symptoms and protocol, then recheck.
- Fluids and feeding: mother’s own expressed breast milk is preferred. Assess coordination; use cup/spoon or orogastric feeding as appropriate. Very immature or unstable infants may need IV fluids/parenteral nutrition. Advance enteral feeds cautiously while watching for NEC.
- Infection: strict hand hygiene and aseptic line care; obtain cultures and start antibiotics promptly only when infection is suspected, then review against results.
- Micronutrients: prescribe iron, vitamin D, calcium/phosphate or fortification according to weight, gestation, feed type and national/facility protocol.
Feeding Readiness and Danger Signs
| Area | Reassuring | Danger |
|---|---|---|
| Feeding | Alert for feeds, coordinated suck, stable breathing | Apnoea, cough/choke, marked fatigue, recurrent desaturation |
| Abdomen | Soft, tolerating feeds | Increasing distension, tenderness, bilious/bloody aspirate or stool |
| General | Warm, active, gaining weight | Temperature instability, lethargy, poor perfusion, seizures |
Nursing Care with Rationales
| Intervention | Rationale |
|---|---|
| Monitor temperature, respiration, apnoea, saturation, heart rate, perfusion and glucose as prescribed. | Immaturity causes rapid, subtle deterioration. |
| Support continuous KMC; teach safe positioning and airway observation. | Improves thermal control, breastfeeding, bonding and survival. |
| Cluster care, reduce noise/light and protect sleep. | Reduces stress and oxygen/energy expenditure. |
| Use meticulous hand hygiene and aseptic technique; minimise invasive devices. | Immature immunity and breached skin increase sepsis risk. |
| Measure prescribed feeds accurately; verify tube position per policy; observe abdomen, stool and residuals only as protocol directs. | Promotes nutrition while detecting intolerance and NEC. |
| Support expression within the early post-birth period and at frequent intervals; provide lactation counselling. | Builds milk supply and reduces reliance on formula. |
| Record daily weight at the same time and scale, fluid balance and growth trend. | Guides nutrition and identifies dehydration or fluid overload. |
| Protect skin, rotate probes, use gentle adhesives and reposition safely. | Preterm skin is fragile and pressure injury occurs quickly. |
| Involve parents in KMC, feeding, hygiene and danger-sign recognition. | Builds competence and continuity after discharge. |
Major Complications
- Respiratory distress syndrome, bronchopulmonary dysplasia, apnoea and patent ductus arteriosus.
- Sepsis, hypothermia, hypoglycaemia, jaundice and anaemia.
- NEC, feeding failure and poor growth.
- Intraventricular haemorrhage, seizures, developmental impairment, hearing loss and cerebral palsy.
- Retinopathy of prematurity—screen eligible infants using the national/facility schedule; careful oxygen control is essential.
Discharge Criteria and Follow-up
The baby should maintain temperature in the planned home method, feed safely, show satisfactory growth, have stable breathing without concerning apnoea, and have completed required screening/immunisation plans. Parents must demonstrate KMC and feeding, know medicines and danger signs, and have a documented follow-up date. Continue growth, neurodevelopmental, vision and hearing surveillance; use corrected age when assessing development.
Prevention
- Quality antenatal care, maternal nutrition, infection prevention/treatment, birth spacing and avoidance of tobacco/alcohol.
- Antenatal corticosteroids, magnesium sulphate for fetal neuroprotection and antibiotics for indicated membrane rupture only under obstetric protocols.
- Timely referral of high-risk pregnancy and birth in a facility able to care for small newborns.
Revision Questions
- Differentiate prematurity, LBW and small for gestational age.
- Explain five physiological vulnerabilities of a preterm infant.
- Describe KMC and nursing care of a 1.6-kg infant.
- List warning signs of NEC and discharge requirements.
References
- WHO recommendations for care of the preterm or low-birth-weight infant
- WHO Kangaroo Mother Care practice guide
- WHO Preterm birth fact sheet
Apply Uganda Ministry of Health and facility protocols for oxygen targets, fluids, feeding volumes, medicines and referral.