Neonatus admits infants <32 weeks gestation or <1500 g directly from the delivery room into the pre-warmed Infant Incubator. The incubator is configured as described in Solution Three, with skin-servo control set to 36.5 °C and relative humidity of 85-90%. The infant is placed in a polyethylene bag or wrap immediately after birth, and the bag is not opened inside the incubator for the first 72 hours, creating a “micro-humidity” environment that reduces transepidermal water loss from 100 mL/kg/day to 30 mL/kg/day.

The incubator’s temperature and humidity logs are recorded at 1-minute intervals and displayed as a trend on the central NICU dashboard. For infants of diabetic mothers or those with suspected neonatal abstinence syndrome, the servo set point is reduced to 36.0 °C, as these infants generate excess metabolic heat and are at risk of hyperthermia. The incubator’s humidity is gradually weaned by 5% per day once the infant reaches 30 weeks corrected gestational age or 1000 g; abrupt humidity removal causes evaporative cooling and a drop in core temperature of 0.5-1.0 °C.

Technical Note: The polyethylene wrap must be placed directly against the infant’s skin with no air pockets; trapped air reduces heat transfer from the incubator by 20%. At Day 3 of life, the wrap is cut along the dorsal surface with heated scissors to allow skin inspection without fully exposing the infant.

For infants requiring frequent procedural access – umbilical line insertion, exchange transfusion, chest drain placement, or surgical procedures at the cot-side – Neonatus transfers the infant from the Incubator to the Infant Radiant Warmer. The warmer’s skin-servo mode is set to 36.5 °C, and the overhead heater maintains a 35-36 °C microenvironment over the mattress. The radiant warmer’s side panels are lowered to permit a sterile surgical field while the heater is angled to maintain temperature without interfering with the operative light.

The infant is covered with a plastic drape with a cut-out over the surgical site, reducing convective heat loss. The radiant warmer’s timer alerts the team every 45 minutes; a break in the procedure for a temperature check is documented in the surgical safety checklist. Immediately after the procedure, the infant is returned to the pre-warmed Incubator, minimising the time in the warmer to <2 hours whenever possible. Prolonged radiant warming in very preterm infants increases insensible water loss by 50% above incubator levels, requiring an immediate increase in intravenous fluid administration.

Technical Note: The radiant warmer must not be placed in a draught from an air-conditioning vent or an open door; a 0.5 m/s air current across the infant increases convective heat loss by 0.5 °C per hour. The warmer’s quartz heating element must be inspected monthly for cracks; a cracked element radiates at a lower temperature and produces an uneven heating pattern with a 3 °C cold spot in the centre of the mattress.

When the infant meets the following criteria – weight >1800 g, gaining weight for >3 consecutive days, tolerating full enteral feeds, and able to maintain a skin temperature of 36.5-37.0 °C in an incubator set to 32 °C air temperature – Neonatus initiates the transition to an Infant Bed open cot. The infant is dressed in a long-sleeved bodysuit, a hat, and a 1.0-tog sleep sack, and placed in a standard neonatal cot with a firm, flat mattress. The room temperature is maintained between 22-24 °C.

The transition protocol involves a 4-hour trial in the cot, with axillary temperature measured at 30, 60, 120, and 240 minutes. If the infant maintains an axillary temperature of 36.5-37.0 °C throughout the trial, the transition is considered successful, and the infant remains in the cot. If the temperature falls below 36.3 °C at any point, the infant is returned to the Incubator, and a new transition attempt is made after 48 hours with an additional layer of clothing and a higher room temperature set-point 24 °C. The cot’s mattress is placed at a 15° head-up tilt to reduce gastro-oesophageal reflux and aid respiratory function.

Technical Note: Axillary temperature must be measured with a digital thermometer placed in the apex of the axilla and held in place for 3 minutes; a quick 30-second measurement under-reads core temperature by 0.2-0.5 °C. The sleep sack must be sized correctly; a sack that is too large leaves an air gap around the torso, reducing its thermal resistance by 40%.

Neonatus configures the thermoregulation program with adaptable protocols for special populations. For infants with gastroschisis or omphalocele, the exposed abdominal contents are wrapped in a saline-moistened gauze and covered with a transparent plastic bag, and the infant is placed in the Incubator with the humidity set to 100% to prevent evaporative desiccation of the viscera. For infants with open neural tube defects, the same high-humidity protocol is used.

For infants requiring therapeutic hypothermia for hypoxic-ischaemic encephalopathy HIE, the Incubator’s servo-control is temporarily disabled, and a separate servo-controlled cooling blanket is placed under the infant. The incubator’s air temperature is set to 28 °C to create a cool ambient environment, while the cooling blanket targets a core temperature of 33.5 °C for 72 hours. The incubator’s skin probe is used as the primary core temperature sensor for the cooling system, avoiding the need for an additional oesophageal probe.

Technical Note: During therapeutic hypothermia, the incubator’s humidity must be reduced to 50% to prevent condensation on the cooling blanket, which can cause skin maceration. The infant’s skin is inspected hourly for evidence of subcutaneous fat necrosis, a rare but serious complication of prolonged cooling.

Neonatus’s central dashboard tracks thermoregulation metrics across the entire NICU. Every admission temperature, the percentage of infants with a temperature <36.5 °C on arrival from the delivery room, the incidence of accidental hypothermia (<36.0 °C) during the first 72 hours, and the success rate of cot transition at first attempt are plotted monthly on a run chart. The NICU’s thermoregulation committee reviews these data and benchmarks them against the Vermont Oxford Network or equivalent neonatal database.

Each case of severe hypothermia core temperature <35.5 °C triggers a root-cause analysis: Was the delivery room temperature adequate? Was the polyethylene wrap applied? Was the transport incubator pre-warmed? Corrective actions are implemented within 2 weeks. An annual thermoregulation competency assessment for all nursing and medical staff includes a written test and a practical demonstration of servo-control setup, humidity weaning, and cot transition.

Technical Note: The dashboard’s data extraction scripts must be validated quarterly by manually auditing 20 randomly selected records; a mismatch rate >5% between the electronic data and the manual audit indicates a sensor-logging fault that must be investigated.