• You're all caught up!

Normal Body Temperature for Infants

author image Deanne Lachner
Deanne Lachner has been writing and editing fiction and nonfiction for more than 15 years. She has published articles in "Working Women," "Performance Magazine" and the "Direct Selling News." Lachner holds a master's degree in English from Texas Woman's University and is pursuing a second master's degree in instructional design and technology.
Normal Body Temperature for Infants
Glass thermometers are dangerous for infants. Photo Credit thermometer image by CraterValley Photo from <a href='http://www.fotolia.com'>Fotolia.com</a>

In infants from birth to 3 months old, an abnormal temperature--either too low or too high--can be a sign of something serious. A baby with a low body temperature may have a serious infection, according to MedlinePlus.com, and an infant with a fever requires an immediate call to the doctor. All parents should know which type of thermometer is most accurate, how to take an infant's temperature safely and the range of temperatures considered normal in an infant.

Thermometer Types

Today's parents have choices among thermometers. The older-style glass mercury thermometers are not recommend for infants because if the glass breaks, mercury vapors are released into the air, according to the Mayo Clinic. Newer choices include the forehead and ear thermometer, the pacifier thermometer, and digital thermometers designed for oral, rectal or armpit use. Temperatures taken in the armpit or with a pacifier thermometer are the least accurate.

Taking an Infant's Temperature

"The most accurate way to take a child's temperature is to use a digital thermometer rectally or orally. Rectal temperatures provide the best readings for infants," reports the Mayo Clinic. Place your infant on her back and lift her legs. For infants up to 3 months, lubricate the tip of a rectal digital thermometer and insert it 1/2 to 1 inch into her rectum. It should slide in easily, but if you feel any resistance, stop. Hold it in place until the thermometer beeps or otherwise signals that it is done. Remove it gently and check the display.

Normal Temperature

Normal Body Temperature for Infants
If your infant's temperature is above normal range, call the doctor. Photo Credit baby image by Dron from Fotolia.com

An infant up to 3 months old has a normal body temperature range of 97 to 100.4 degrees Fahrenheit, 36 to 38 degrees Celsius, according to the American Academy of Pediatrics. Temperatures both higher and lower than this range are a cause for concern.


A baby 3 months or younger is considered to have a fever when his temperature is 100.4 degrees Fahrenheit, or 38 degrees Celsius, or higher. With older children, parents are advised to watch a feverish baby's behavior before calling the doctor. If the older baby is playing and eating well, for example, he probably doesn't need immediate medical attention. However, with infants up to 3 months, BabyCenter says to call the doctor immediately if he has a fever because he could have an illness.


Normal Body Temperature for Infants
In addition to keeping a baby's room cool, put her to sleep on her back to reduce the risk of SIDS. Photo Credit baby image by Dron from Fotolia.com

Babies who sleep in a room that causes them to become too hot are at an increased risk for Sudden Infant Death Syndrome, commonly called SIDS, according to the Utah Department of Health. It recommends against putting your baby to sleep with too much bedding or clothing and to use a fan, as well-ventilated rooms reduce the risk of SIDS by up to 70 percent. Some signs that your baby is too hot include damp hair, a heat rash, fast breathing, fever and sweating.

Never give aspirin to an infant with a fever, as it can cause Reye's syndrome, a disorder than is potentially fatal. In addition, don't give ibuprofen to babies under 6 months, according to the Mayo Clinic.

LiveStrong Calorie Tracker
Lose Weight. Feel Great! Change your life with MyPlate by LIVESTRONG.COM
  • Gain 2 pounds per week
  • Gain 1.5 pounds per week
  • Gain 1 pound per week
  • Gain 0.5 pound per week
  • Maintain my current weight
  • Lose 0.5 pound per week
  • Lose 1 pound per week
  • Lose 1.5 pounds per week
  • Lose 2 pounds per week
  • Female
  • Male
ft. in.



Demand Media