Baby Health
High Temperatures
A high temperature, or fever, is usually caused by an infection. The source of the infection can be a bacteria or a virus. Babies less than six months old should be taken to their health care provider if they have a fever. Call your health care provider or Healthlink BC at 8‑1‑1.
Acetylsalicylic acid (ASA or aspirin) should not be given to babies, children, or teenagers. If used when there is a fever, there is a link between ASA and the development of a very dangerous illness called Reye's Syndrome.
Some signs of fever in your baby are:
- the back of the neck feels hot, even when extra clothing is removed
- having no interest in usual things
- looking ill or overly sleepy
- looking flushed or pale
- may be sweaty
- may be extra thirsty
You can also call HealthLink BC at 8‑1‑1.
What kind of thermometer should I use?
Use an easy‑to‑read thermometer, such as a digital one. A rectal thermometer is not recommended as this might cause rectal injuries. If you suspect that your baby has a fever, you can check by taking a temperature under his or her armpit.
How should I take the temperature?
- Do not take your baby’s temperature by mouth.
- Put the tip of the thermometer in the centre of the armpit.
- Tuck the arm snugly against the body, then comfort and distract your baby.
- After about one minute the thermometer will beep if it’s digital. If it is not digital, wait about five minutes. Gently remove the thermometer and read the temperature.
- If you find your baby has a temperature by taking it under the arm, check it again.
What is a normal temperature range?
Your baby’s body temperature changes throughout the day. It is lowest in the early morning and highest in the early evening. Normal temperature taken under the armpit is 36.5°C to 37.4°C. Your infant may have a higher or lower temperature and still be considered normal.
