When should i call the doctor for my baby's fever?

100.4: In general, a fever in a newborn is a rectal temperature of 100.4f or higher (38.0 celsius). If you are checking the temperature by other means (such as under the arm), it may register lower by up to a degree than the baby's real temperature. Fever is most urgent in the first couple of months, when the baby's immune system is at it's lowest. As your baby gets older, threshold for fever gets higher.

Depends on age: According to the experts 100.4 f is a fever. Any baby under 1 month with 100.4 needs to be evaluated immediately because newborns are less likely to run fevers and are more likely to have serious illness associated with fever. Babies under 5 months with a fever should also be seen by their physician promptly. Older children with fever who look good and have no specific complaints can be observed.

When less than 3 mos: It depends on the age of your child as well as other symptoms. For any baby under 3 months of age, a fever over 100.4 deg F taken rectally is considered a fever and an emergency. When your child is older than that, if they have any other concerning symptoms with the fever such as ear pain, deep cough, trouble breathing, lethargy, or the fever persists, you should call your doctor.