Monitoring a baby’s body temperature is an important way for parents to track their child’s health. However, many parents are unsure about the normal temperature for a newborn and when a temperature should be considered a fever.
In general, a baby’s body temperature falls within the range of 36.5°C to 37.5°C (97.7°F to 99.5°F). This range may vary slightly depending on the time of day, activity level, and the method used to measure temperature. Temperatures are often slightly higher in the afternoon or evening and lower in the early morning.
By measurement method:
- Underarm (axillary): 36.5°C – 37.3°C
- Oral (older babies): 36.8°C – 37.5°C
- Rectal: 37.0°C – 38.0°C
For newborns, underarm measurement is the safest and most commonly recommended method.
When Is a Baby Considered to Have a Fever?
- Underarm temperature is 37.5°C (99.5°F) or higher
- Rectal temperature is 38°C (100.4°F) or higher
If a baby has a fever along with symptoms such as poor feeding, unusual fussiness, or lethargy, parents should seek medical advice.
- Measure when the baby is calm and resting
- Avoid measuring right after feeding or crying
- Use a digital thermometer designed for infants
Understanding the baby body temperature range helps parents identify early signs of illness and care for their newborn with confidence.
When a baby’s body temperature fluctuates, especially during warm weather or mild fever, the skin can lose moisture and barrier function more easily. KOAI Baby Moisturizing Cream, safe for babies from birth, helps maintain hydration and support the skin barrier during sensitive periods.
