Reference — Maternal-Newborn
Newborn Vital Signs Reference
Newborn vital signs differ significantly from adult norms. This reference provides normal ranges for temperature, heart rate, respiratory rate, SpO₂, blood pressure, and blood glucose — with clinical significance and action thresholds for NCLEX and bedside practice.
Educational use only. Vital sign ranges may vary by gestational age, postnatal age, and clinical context. Normal values shift during the transitional period. Always apply clinical judgment and follow NRP guidelines and institutional protocols. This material supports nursing education and exam review. It is not medical advice and is not a substitute for clinical judgment, institutional policy, or medical direction. Always follow facility protocols and current provider orders.
Normal Ranges — Term Newborn
| Parameter | Normal Range | Low Threshold | High Threshold |
|---|---|---|---|
| Heart rate | 110–160 bpm | <100 bpm | >160 bpm at rest |
| Respiratory rate | 30–60 breaths/min | <30/min | >60/min (tachypnea) |
| Temperature (axillary) | 36.5–37.5°C (97.7–99.5°F) | <36.5°C (hypothermia) | >38°C (fever) |
| SpO₂ (by 10 min of age) | ≥95% | Below NRP target table | N/A (hyperoxia concern in preterm) |
| Blood glucose (after 4 hrs) | ≥45 mg/dL | <25 symptomatic / <45 at-risk | Screen IDM, LGA, preterm |
Heart Rate
- Normal: 110–160 bpm; brief fluctuations with activity (crying, feeding) are expected
- Bradycardia (<100 bpm): Stimulate; if no response, initiate NRP positive pressure ventilation; apnea often precedes bradycardia in newborns
- Tachycardia (>160 bpm persistent): Assess for fever, infection, dehydration, cardiac arrhythmia, pain
- Method: Auscultate apically for 60 seconds; umbilical pulse palpation may be used in delivery room; pulse oximeter provides continuous rate
Transitional tachycardia:
Heart rate may briefly exceed 160 bpm during the first 30–60 minutes of life as part of normal cardiopulmonary transition. Persistent tachycardia after transition warrants evaluation.
Respiratory Rate
- Normal: 30–60 breaths/min; count for full 60 seconds (irregular rhythm normal)
- Tachypnea (>60/min): Assess for respiratory distress — grunting, nasal flaring, retractions, central cyanosis
- Periodic breathing: Brief pauses of <10 seconds — normal in newborns; true apnea (>20 seconds or <20 seconds with bradycardia) is abnormal
Signs of respiratory distress:
- Grunting (auto-PEEP to maintain FRC — ominous sign)
- Nasal flaring
- Intercostal, subcostal, or sternal retractions
- Central cyanosis (lips, mucous membranes)
- Seesaw (paradoxical) respirations
Temperature
- Normal axillary: 36.5–37.5°C (97.7–99.5°F) — axillary is preferred route for newborns
- Hypothermia (<36.5°C): Newborns cannot shiver; at risk for cold stress → hypoglycemia, metabolic acidosis, apnea. Warm with radiant warmer, skin-to-skin, warmed blankets. Prevent evaporative heat loss at delivery (dry immediately).
- Fever (>38°C): Abnormal in newborns — sepsis workup indicated; rule out environmental overheating first
- Rectal temperature: Not routinely recommended; used to assess patency of anus (once only)
Thermoregulation priority:
Dry, warm, and cover immediately after birth. Skin-to-skin with mother is the most effective thermoregulation strategy for stable newborns. Radiant warmer for unstable or preterm infants.
Blood Pressure
Blood pressure is not routinely assessed in healthy term newborns but is monitored in sick, preterm, or at-risk neonates.
| Age | Systolic (mmHg) | Diastolic (mmHg) | MAP (mmHg) |
|---|---|---|---|
| Term newborn (day 1) | 60–76 | 30–44 | ≥40 |
| Term newborn (day 3–7) | 74–94 | 37–55 | 50–62 |
| Preterm (<37 wks) | Variable; MAP ≈ gestational age in wks | Variable | ≥ gestational age (wks) |
Use appropriate neonatal cuff size — cuff too small falsely elevates readings; cuff too large falsely lowers them.
Blood Glucose
Normal glucose (after 4 hours of age):
- ≥45 mg/dL is the general threshold for clinical concern
- Glucose normally transiently drops after birth (to ~45–50 mg/dL) then rises with feeding
Neonatal hypoglycemia action thresholds (AAP guidelines):
| Age | Threshold | Action |
|---|---|---|
| 0–4 hours | <25 mg/dL | Feed immediately; if symptomatic → IV dextrose |
| 4–24 hours | <35 mg/dL | Feed; recheck in 1 hour; IV dextrose if persistent |
| Any symptomatic | Any level with symptoms | IV dextrose immediately; continuous glucose monitoring |
High-risk infants for hypoglycemia:
- IDM (infant of diabetic mother) — most common NCLEX scenario
- LGA (large for gestational age) and SGA (small for gestational age)
- Preterm infants
- Infants with perinatal stress
SpO₂ — NRP Target Saturation Table
| Minutes After Birth | Target SpO₂ |
|---|---|
| 1 minute | 60–65% |
| 2 minutes | 65–70% |
| 3 minutes | 70–75% |
| 4 minutes | 75–80% |
| 5 minutes | 80–85% |
| 10 minutes | 85–95% |
SpO₂ probe placed on right hand (pre-ductal) for delivery room monitoring. Do not target >95% in preterm infants — excess oxygen causes retinopathy of prematurity (ROP).
Related Resources
Standards & sources
Fact-checked Jun 20, 2026This page is written to align with American College of Obstetricians and Gynecologists (ACOG) · AWHONN · American Academy of Pediatrics (AAP) — newborn. It is an educational summary, not a citation of any single document — always verify specific doses, values, and protocols against current guidelines and your facility policy. How we source content →