Is fever in a newborn always dangerous?

On top of what Hui Qun has mentioned, it is also important to note that there are 2 types of fevers that afflict babies: viral fever and bacterial fever. A viral fever occurs when the body fights off an illness caused by a virus like the flu, or the common cold. Viral fevers tend to subside within three days and antibiotics have no effect on viruses. Bacterial fever, on the other hand, occurs when the body fights off a bacterial infection like a urinary tract infection, or bacterial pneumonia. Bacterial infections are less common than viruses – and more concerning, because they can lead to serious illness if left untreated. Antibiotics are usually required. Generally, if your baby's fever lasts longer than three days, it's time to see a doctor. http://www.babycenter.com/0_fever-in-babies-7-things-you-might-not-know_10373598.bc