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What if My Child Is Running a Fever?

A fever within your child is not always apparent but sometimes a touch to the skin is enough to alert you. Treating a fever in your child may vary, but using a digital thermometer measures the body temperature and will confirm a fever. If your child’s body temperature has reached 100°F or above, it’s best to visit your Chicago pediatrician, Dr. Maria Staisz with Pediatric Clinic in Chicago, IL.

Causes of Fevers

Your child having a fever is typically due to a specific cause, such as:

  • The body fighting an infection or illness through the body’s defense responders.
  • Overdressing your infant (specifically, newborns) can cause a fever due to your child’s body being unable to regulate their body temperature at such an early age.
  • Vaccinations can sometimes cause infants and young children to experience a mild fever.

Taking Your Child’s Temperature 

Digital thermometers can measure your child’s temperature to determine if they do have a fever or not in one of three different approaches:

  • Inside of the mouth–100°F or higher is a fever
  • Taken from the child’s (usually for children age 1 or younger) rectum–100.4°F or higher is a fever
  • Measured from the armpit–99°F or higher is a fever

Though taking your child’s temperature is important, their condition should be fully observed if you notice changes in their breathing pattern (e.g. faster breathing, difficultly breathing, or is still breathing rapidly once the body temperature regulates).

Treating a Fever

Not all fevers require a visit with your Chicago, IL, pediatrician, however, it’s important to monitor your child’s condition and if their discomfort increases.

For children whose body temperature is below 102.2°F, it is unlikely any medication will be necessary, but that depends on their response to the fever. However, if the older child’s temperature reaches 102.2°F or higher, promptly call Pediatric Clinic in Chicago, IL, to determine the next steps for your child.

It’s important to note that in the case of a fever in your infant of 3 months or younger if their rectal temperature has reached 100.4°F or higher, you should call Dr. Staisz or head to a hospital emergency unit immediately.

Your Chicago Pediatrician Can Help

Your child’s discomfort may trigger your own, as it is challenging to watch them in a distressed state. At Pediatric Clinic in Chicago, IL, it is our top priority to alleviate your child’s intensified condition and manage their fever with the help of your Chicago pediatrician, Dr. Staisz.

If concerned about your child’s fever, call our office today at (773) 725-5400.

Cathy Alvarez, MSN, CPNP-PC

Family Practice

Cathy Alvarez, MSN, CPNP-PC, is a board-certified Pediatric Nurse Practitioner with over two decades of experience dedicated to nurturing the health and well-being of children from birth through adolescence. Known for her warm, individualized approach to care, Cathy is passionate about building lasting relationships with her patients and their families—many of whom she’s supported through every milestone of childhood.

Cathy began her nursing career after earning her Bachelor of Science in Nursing from the University of Illinois at Chicago in 1999. She gained valuable experience working on the inpatient pediatric unit at Advocate Lutheran Children’s Hospital in Aurora. Driven to deepen her impact, she returned to UIC to complete the Pediatric Nurse Practitioner program, earning her Master of Science in Nursing in 2005. She is certified by the Pediatric Nursing Certification Board (PNCB) and has since devoted her career to providing expert care to diverse pediatric populations.

She is an active member of the National Association of Pediatric Nurse Practitioners and the American Cleft Palate-Craniofacial Association, always staying at the forefront of pediatric healthcare.
Fluent in English and Polish, with conversational Spanish skills, Cathy connects seamlessly with families from many cultural backgrounds.

Outside of work, you can find her cheering on her son at soccer games, exploring new destinations, and enjoying quality time with her family. Her caring spirit and clinical excellence make her a trusted partner in every child’s healthcare journey.” 

Marixa Alvarez, ARN, MSN, FNP-BC

Family Practice

Marixa Alvarez, ARN, MSN, FNP-BC, is a dedicated and compassionate Family Nurse Practitioner, board certified by the American Nurses Credentialing Center. She earned her Master of Science in Nursing from Lewis University, where she cultivated her passion for holistic, patient-centered care.

Fluent in both English and Spanish, Marixa connects deeply with diverse communities, ensuring every patient feels heard and supported. Outside of the clinic, you’ll likely find her in the kitchen—cooking, baking, and bringing people together over a homemade meal. A fun fact? Marixa has a knack for solving puzzles and putting things together—whether it’s a 1,000-piece jigsaw or helping patients piece together their path to better health.

Carlos Sian, PA

Physician Assistant

Carlos is a board-certified Physician Assistant who joined the IWS Family Health team in January 2024. He was born and raised in Antigua, Guatemala and is fluent in both English and Spanish.

His academic journey began at Saint Michael’s College, where he earned a Bachelor of Science in Biology alongside minors in Chemistry and Religious Studies. Driven by a commitment to service, he devoted a year to volunteering as a medical assistant at a health clinic in Albuquerque, NM, through the Jesuit Volunteer Corps. This experience solidified his interest in medicine, inspiring him to delve deeper into healthcare and ultimately leading Carlos to pursue a Master of Public Health in Community Health Sciences and Infectious Diseases from Boston University School of Public Health.

Following his MPH, Carlos dedicated several years to the public health sector, primarily serving as a linkage to care coordinator,  clinical research coordinator, and COVID-19 contact tracer. Moved by a need to help his community during the 2020 pandemic, he secured admission to and completed the Northwestern University Feinberg School of Medicine PA program, earning his Master of Medical Science degree.

Carlos aims to integrate his public health training with his medical practice to bring culturally competent and inclusive medical services to all his patients, but specially the Hispanic/Latino and LGTBQ+ communities he serves. In his downtime, Carlos enjoys cooking, collecting plants, fostering dogs, playing video games, watching reality TV shows, and adding more stamps to his passport!

Dr. Tara Ioffe

Family Practice

Dr. Tara Ioffe is a dedicated and compassionate Board-Certified Family Medicine physician with a strong commitment to providing excellent care to her patients. She obtained her medical degree from Avalon University in Curacao and went on to complete her Family Medicine Residency at the University of Oklahoma. She has worked at the University of Chicago and most recently NorthShore University. She has since returned to Chicago and is thrilled to join the IWS Family Health team in 2023, where she will continue to provide excellent care to her patients.

Throughout her career, Dr. Ioffe has gained experience in diverse medical fields, such as immediate and urgent care medicine while working at NorthShore Immediate Care. She did clinical research at the University of Chicago. Dr. Ioffe strives to foster a secure and inclusive environment for all her patients. She believes in an integrated approach to medicine, dedicating her time to understand each patient’s unique needs.

During her leisure time, Dr. Ioffe indulges in reading a variety of books for pleasure, plays boardgames, and loves to explore Chicago with her spouse and young child.