Welcome to The Essential New Moms Survival Guide ( How to Take an Infant's Temperature )
Your baby's first cold is stressful in and of itself, but what about taking his temperature for the first time? Know that any temperature of 100.4 degrees F and higher in a young baby is considered to be a fever and you should call the pediatrician.
You can take your baby's temperature rectally, under the armpit or even with a thermometer that measures temperature with the push of a button to the forehead.
"The most accurate way to take your baby's temperature when they are little is rectally, by putting the baby on its back, holding the baby steady and maybe even putting petroleum jelly on the tip of the thermometer," says Slocum. "Once it beeps, then you know the temperature has been found." Armpit thermometers can often give lower readings and are not recommended for babies under 3 months. Same goes for temporal thermometers.