FEED NOW AND RECHECK - DO NOT WAIT FOR THE REFERRAL
Neonatal Hypoglycemia - StatPearls (NCBI Bookshelf NBK537105) - https://www.ncbi.nlm.nih.gov/books/NBK537105/
The first action is a feed and a repeat glucose, not a telephone call. Feeding works within minutes, referral does not, and the harm here is done by the hours a baby spends low while transport is arranged. Screen the babies who are at risk before they are symptomatic, because most of them look well.
- FEED FIRST - where the baby has a low sugar but no symptoms, the best thing to do is feed more often. Getting breastfeeding started early matters for every newborn. Re-check the blood glucose an hour after the feed.
- WHICH BABIES TO SCREEN, AND WHEN - the latest AAP guidance screens a late preterm or term baby who shows symptoms of a low sugar, and screens the highest-risk babies without symptoms too, across the first 12 to 24 hours after birth. The at-risk group it names: late preterm babies of 34 to 36.6 weeks' gestation, term babies small for their gestational age, babies born to diabetic mothers, and babies large for their gestational age. For those, the AAP wants feeding begun inside the first hour after birth, and the first glucose measured 30 minutes after that first feed.
- AND WHICH BABIES NOT TO - a healthy term baby, after an uncomplicated pregnancy and birth, does NOT need the sugar screened or watched as a routine. Sticking every well newborn produces false alarms and separates mothers from babies for nothing.
- THE NUMBERS TO ACT ON - the AAP aims for a blood glucose at or above 45 mg/dL before each routine feed, and intervenes below 40 mg/dL during the first 4 hours after birth, and below 45 mg/dL from 4 hours to 24 hours. A different society sets a higher target: the PES wants above 50 mg/dL in an at-risk baby with no congenital disorder suspected, over the first 48 hours, and above 60 mg/dL after that. The two guidelines genuinely disagree and the article says so; treat the lower thresholds as the floor, not as the aim.
- WHO NEEDS A DRIP AND A NEONATAL UNIT - three groups. Any baby with symptoms whose glucose is under 40 mg/dL. Any baby whose hypoglycaemia persists despite feeding more often. And an at-risk baby without symptoms whose glucose is extremely low: under 25 mg/dL during the first 4 hours after birth, or under 35 mg/dL from 4 hours to 24 hours. Those three go to the neonatal unit.
- A LOW SUGAR IS NOT A DIAGNOSIS ON ITS OWN - what a hypoglycaemic newborn shows is non-specific, and it overlaps with prematurity, with sepsis, with hypoxic-ischaemic encephalopathy and with a low sodium. Treat the sugar, then look for the sepsis.
- THE BABY WHO WILL NOT STAY UP IS A DIFFERENT PROBLEM - a baby needing intravenous dextrose at a high rate, above 12 to 16 mg/kg/minute, or needing it beyond 5 days, more often has a persistent cause behind the hypoglycaemia. Where a baby cannot hold those glucose targets on a regular feeding schedule, look for that persistent cause before sending them home. The recommendation is to bring endocrinology or genetics in early.
- WHY IT IS WORTH THE FUSS - a hypoglycaemia that is severe and goes on can end badly indeed: lasting neurodevelopmental disability, cerebral palsy, death. The article is honest that the evidence on mild, brief, asymptomatic dips is weak, and that is a reason to avoid over-treating a well baby, not a reason to leave a symptomatic one.
- DO NOT COST THE MOTHER HER MILK SUPPLY TO CHASE A NUMBER - giving formula risks the establishment of breastfeeding, and it changes the newborn's microbiome, which may raise the risk of infection and of allergy later. The approach that works best is the one that keeps mother and baby together and gets breastfeeding going early.