It can be scary when your baby has their first fever. "As a parent or caregiver, you want to know what's normal, what's not, and when to get help," says Cara G. Lye, MD, FAAP, Pediatrics at ARC Bee Cave. "A fever is often the body's way of fighting off germs and an infection, but it's important to watch your newborn (under 28 days old) or infant (28 days and older) closely." Knowing the right steps can help you keep your child safe and healthy.
What are the common causes of fever in infants?
Fevers can be caused by many things. Infections from viruses or bacteria are the most common. Teething may raise a baby's temperature slightly, but it usually doesn't cause a high fever. Other causes include immunizations, colds, and ear infections. It's also possible your child picked up germs from a daycare or childcare setting.
How long do fevers typically last in an infant?
Most fevers in infants and babies last one to three days. A fever is usually a sign that your baby's immune system is working to fight off an infection, like the common cold, ear infection, or even pneumonia. Sometimes, immunizations can cause a mild fever too, but always monitor for changes.
Comforting and monitoring your baby at home
Start by taking your baby's temperature with a reliable rectal thermometer. For newborns under a month, a fever of 100.4°F or higher needs immediate attention at an emergency room (ER). For older babies, dress them in light clothing, offer fluids to keep them hydrated, and use a lukewarm bath to help lower a high temperature. Soft cuddles and soft food may help if your child is fussy.
When to take your baby to the doctor for a fever
- For newborns under one month, a fever of 100.4°F or higher needs immediate attention at an ER.
- For newborns over one month with a fever of 100.4°F or higher, call the clinic, message your pediatrician via MyChart, or visit the emergency room.
- For infants over three months with a fever or 102.2°F or higher or is very drowsy, hard to wake, not drinking fluids, or have vomiting, diarrhea, cough, or trouble breathing, call the clinic, message your pediatrician via MyChart, or visit the emergency room.
ARC has a 24/7 nurse line if you are unsure of what course to take and would like the opinion of a medical professional.
A fever lasting more than three days or returning often is also a reason to see a pediatrician or advanced practice clinician (APC). Watch for other signs and symptoms of serious illness and trust your gut—seek immediate care if something doesn't feel right.
Learn more about ARC 24/7 Medical Care resources including telemedicine visits, same-day visits, After Hours Clinic appointments, and 24/7 phone nurses.
"Knowing when to care at home and when to seek medical attention can make a big difference in helping your baby feel better and stay safe," says Dr. Lye. "And you as well!"
Make an appointment today
Dr. Lye is accepting new patients, newborn to 18 years old, at ARC Bee Cave. Schedule an appointment with Dr. Lye online or through ARC MyChart.
Pediatric care for Bee Cave and surrounding communities
ARC Bee Cave, located at 15801 Highway 71, offers a convenient location for patients seeking pediatric care in Bee Cave, as well as those in nearby areas such as Lakeway, The Hills, and West Austin. ARC Pediatrics doctors and APCs focus on a full range of services for patients from birth through 18 years.