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Newborn hypoglycaemia: who is at risk, heel-prick glucose and early feeding

  • Safe practice

Babies at risk of low blood sugar are fed early and often, kept warm, and have heel-prick checks at set times; a baby with symptoms is checked at once.

Updated

What it is

In the first hours after birth a newborn's blood glucose falls and then recovers. Some babies cannot keep it up: preterm, small or large babies, babies of diabetic mothers, and babies who are cold, infected or had a hard birth. Low glucose may cause no signs at first, but severe or prolonged hypoglycaemia can harm the developing brain. The nurse identifies the babies at risk, starts feeding in the first hour, keeps them warm, takes heel-prick checks at the times the protocol sets, and acts on a low result as the protocol says. Babies without risk factors do not need routine checks, only watching for symptoms.

What it requires

  • The threshold that defines hypoglycaemia differs between guidelines; use the one in the institutional protocol.
  • Babies without risk factors do not need routine glucose monitoring.
  • Checks stop only when the protocol's criteria are met, for example two normal pre-feed values with good feeding.
  • Glucose can drop again after treatment, so the baby is still watched.

Components

  • Identifying the at-risk baby at birth.
  • Early, frequent feeding with breast milk.
  • Warmth and skin-to-skin contact.
  • Heel-prick glucose at set times, recorded on a feeding chart.
  • A written plan for low results, per protocol.

How it is applied (and why)

  1. Identify at-risk babies at birth and start the protocol — only they need routine checks.
  2. Dry the baby, place it skin to skin and keep it warm — a cold baby uses up glucose faster.
  3. Support a breastfeed within the first hour, then at least every 3 hours — breast milk is the first treatment and prevention.
  4. If the baby cannot suckle, give expressed breast milk by cup or syringe as the protocol says, and help the mother express often.
  5. Take the heel-prick check at the set times, before a feed, with the technique of the institutional protocol — the baby can stay skin to skin.
  6. At every feed check temperature, colour, breathing and tone — these can show low glucose before a scheduled check.
  7. Record feeds, results and actions on the feeding chart — the team sees the trend.
  8. If the result is low, follow the protocol (extra feed, oral glucose gel or IV glucose by order) and recheck when it says — late action risks brain harm.
  9. Stop checks only when the protocol's criteria are met, and keep watching feeds — glucose can fall again.

In nursing practice

  • Signs that need an immediate check: jitteriness or tremors, irritability, poor feeding or vomiting, floppiness, lethargy, apnoea, fast breathing, cyanosis or pallor, trouble staying warm, a weak or high-pitched cry, seizures.
  • Jitteriness that stops when the limb is held, with normal heart rate and breathing, is often benign in a term baby; in an at-risk baby, check the glucose.
  • Growth-restricted babies and babies of mothers with severe hypertension also need glucose and electrolytes at about 12 hours, per Resolution 3280.
  • Severe or long-lasting hypoglycaemia can affect brain development, especially in small babies and babies of diabetic mothers.

Common mistakes

  • Checking every newborn routinely instead of the at-risk babies.
  • Delaying the first feed or letting the baby get cold.
  • Giving formula without need instead of supporting breastfeeding and expression.
  • Waiting for the scheduled check when the baby already has symptoms.
  • Stopping observation as soon as one value is normal.

Test yourself

Think of the answer, then tap the question to see it.

Which newborns need routine blood glucose checks?

Babies at risk: preterm, small or large for gestational age, babies of diabetic mothers, and babies who are cold, infected, asphyxiated or feeding poorly.

When should an at-risk newborn have its first feed?

Within the first hour of life, then at least every 3 hours.

At what ages does Resolution 3280 ask for glucose checks in the baby of a diabetic mother?

At 2 and 4 hours of age, then according to the results.

What does the nurse do if an at-risk baby becomes jittery and feeds poorly before the next scheduled check?

Checks the blood glucose at once and tells the team.

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Connections

← All of nursing

Educational content for students; it does not replace your institution's protocols, supervised clinical training or a prescriber's order. Dose-calculation examples use made-up numbers: they are educational, not a clinical order.

Sources: Guideline for the prevention and management of hypoglycaemia in high risk infants on the postnatal ward (Wales Neonatal Network, NHS Wales, 2018); Low blood sugar - newborns (MedlinePlus, U.S. National Library of Medicine, 2025); Resolución 3280 de 2018: lineamientos técnicos y operativos de la Ruta de Promoción y Mantenimiento de la Salud y de la Ruta Materno Perinatal (Ministerio de Salud y Protección Social de Colombia, 2018).

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