Every fall, Chicago parents start hearing the same sounds at home: a dry cough at night, a runny nose at breakfast, a child who suddenly wants to stay on the couch. Flu and RSV season in Chicago usually starts in October and can last well into spring. Most children recover at home with rest and fluids, but some need a doctor quickly. This guide explains how to tell common illnesses apart, how to protect your family, how to care for a sick child, and when to call your pediatrician.

At ASB Medical Clinic on Irving Park Road, Dr. Anna Banas has cared for children from Portage Park, Dunning, Irving Park, and nearby neighborhoods since 1994. Every winter we see the same questions from worried parents, so we put the answers in one place.

When Does Flu and RSV Season Start in Chicago?

In Chicago, respiratory viruses follow the weather. As temperatures drop, families spend more time indoors, windows stay closed, and germs spread easily in classrooms, daycare rooms, and crowded CTA buses. Flu and RSV activity often starts to rise in October and November. It usually peaks between December and February, then slowly drops in March and April.

Every season is a little different. Some years RSV arrives early and fills pediatric clinics before Thanksgiving. Other years flu peaks late, after winter break, when children return to school and share whatever they caught during holiday travel. The safest plan is to get ready in early fall, before illness spreads in your child’s school.

Chicago winters add a few local challenges:

• Dry indoor air. Radiators and forced-air heat dry out the nose and throat, which can make coughs and congestion feel worse.
• Long indoor stretches. Cold weather keeps kids inside for recess, sports, and play dates, which brings children closer together.
• Holiday travel. Trips through O’Hare and Midway and family gatherings can bring new viruses home.
• Shared spaces. Two-flats, apartment buildings, and multi-generation homes mean grandparents and babies often share the same air.

Cold, Flu, RSV, or COVID-19: How to Tell the Difference

Many respiratory viruses look alike in the first day or two. A runny nose and cough can belong to a simple cold, the flu, RSV, or COVID-19. You do not need to make a diagnosis at home, but knowing the typical patterns helps you decide how closely to watch your child.

Sign	Common cold	Flu	RSV
How it starts	Slowly, over a day or two	Suddenly, often within hours	Like a cold, then may get worse on days 3 to 5
Fever	Rare or low	Common, often high, lasts 3 to 4 days	Possible, but many babies have no fever
Body aches and tiredness	Mild	Common and often strong	Fussiness, less active
Cough	Mild to moderate	Common, can be severe	Can turn into wheezing or fast breathing
Runny or stuffy nose	Very common	Sometimes	Very common, thick mucus
Who gets sickest	Rarely serious	Children under 5, especially under 2, and kids with asthma	Babies under 6 months and premature infants

COVID-19 can look like any of these illnesses. It may also cause a sore throat, headache, stomach upset, or loss of taste or smell in older children. If your child has been around someone with COVID-19 or flu, tell us when you call, because testing can guide treatment.

The CDC’s guide to flu symptoms has a helpful cold-versus-flu comparison if you want more detail.

RSV in Babies and Toddlers: What Chicago Parents Should Watch For

RSV, or respiratory syncytial virus, is a common virus that most children catch by age 2. In older kids and adults it usually feels like a cold. In babies, it can travel down into the small airways of the lungs and cause bronchiolitis or pneumonia.

RSV often starts mild and gets worse a few days into the illness. Early signs include a runny nose, eating or drinking less, and a cough. In very young infants, the signs can be easy to miss:

• Fussiness or unusual irritability
• Less activity or more sleepiness than usual
• Feeding less at the breast or bottle
• Pauses in breathing that last longer than 10 seconds

Many babies with RSV do not have a fever, so a normal temperature does not rule it out. Watch your baby’s breathing closely. Fast breathing, flaring nostrils, a grunting sound, or skin pulling in between the ribs are signs that your baby needs to be seen right away.

According to the CDC’s RSV guidance for infants, the children at highest risk include young infants, babies born early, and children with chronic lung or heart disease or weak immune systems. If your baby falls into one of these groups, call us at the first sign of breathing trouble.

How to Protect Your Family Before the Season Peaks

The best time to prepare for flu and RSV season in Chicago is September and October, before viruses spread widely. A few simple steps lower your child’s chance of getting very sick.

Get the yearly flu vaccine

The CDC recommends a flu vaccine every year for everyone 6 months and older, with rare exceptions. The flu virus changes from season to season, so last year’s shot does not fully protect your child this year. Children between 6 months and 8 years who are getting a flu vaccine for the first time usually need two doses, given at least four weeks apart. Starting early in the fall gives time for both doses before flu peaks.

ASB Medical Clinic offers flu shots for children of all ages as part of our pediatric immunizations and vaccinations. We can often give the flu shot during a well-child visit or a sports physical, so you save a trip.

Ask about RSV protection for your baby

The CDC recommends one of two options to protect babies from severe RSV: an RSV vaccine given to the mother during pregnancy, or an RSV antibody given to the infant. Most babies do not need both. If you are expecting, or your baby was born recently, ask us which option fits your family. We can also review your baby’s hospital records to see what was already given after birth.

Build healthy habits at home

• Wash hands often. Teach children to wash with soap for 20 seconds, especially after school, before meals, and after blowing their nose.
• Cover coughs and sneezes. Practice the “elbow sneeze” with younger kids until it becomes a habit.
• Protect the youngest. Keep newborns away from anyone with a cold, including siblings and visiting relatives, when you can.
• Do not share cups or utensils. Give each child a labeled water bottle for school and sports.
• Keep sleep on track. Tired children catch more infections. Aim for a steady bedtime even during winter break.
• Add moisture to dry air. A cool-mist humidifier in the bedroom can ease a stuffy nose during radiator season. Clean it often, following the instructions.

Caring for a Sick Child at Home

Most colds, and many cases of flu, can be managed at home. Your goal is to keep your child comfortable, hydrated, and rested while the body fights the virus.

Fluids come first

Offer small sips often instead of large drinks. Water, breast milk, formula, diluted juice, popsicles, and soup all count. For babies, feed more often if they take less at each feeding. Count wet diapers. Fewer wet diapers than usual is an early sign of dehydration.

Treat discomfort, not the number

Fever is the body’s normal way of fighting infection, and it is not dangerous on its own in most children. If your child is uncomfortable, you can use acetaminophen, or ibuprofen for babies 6 months and older. Always dose by your child’s current weight, and use the measuring tool that comes with the medicine. If you are not sure about the dose, call us.

A few important safety rules:

• Never give aspirin to children or teens with a viral illness.
• Do not give honey to babies younger than 1 year.
• Avoid over-the-counter cough and cold medicines for young children unless your pediatrician recommends them.
• Do not combine products that contain the same medicine, such as two that both include acetaminophen.

Clear the nose

Babies breathe mostly through their nose, so congestion makes feeding hard. Saline drops followed by gentle suction with a bulb or nasal aspirator before feeds and sleep can help a lot. Older children can use saline spray and blow their nose often.

Let your child rest

Quiet play, books, and extra naps are all fine. Your child does not need to stay in bed all day, but they should not go back to sports or school until they feel better.

When to Call Your Pediatrician

Trust your instincts. You know your child better than anyone, and it is always fine to call us if something feels wrong. Call our office at (773) 777-4767 if your child has any of these signs:

• A fever in a baby younger than 3 months
• A fever that lasts more than 3 days in an older child
• Ear pain, sinus pain, or a sore throat with a high fever
• A cough that lasts longer than 10 days or keeps getting worse
• Fewer wet diapers or less urine than usual
• Wheezing, or breathing that seems faster than normal
• Symptoms that improve and then come back worse
• A child with asthma, heart disease, or another chronic condition who gets sick

Families who call early in the day can often get a same-day sick visit at our clinic. Seeing your own pediatrician means the doctor already knows your child’s history, medicines, and allergies.

Emergency Warning Signs: When to Go to the ER

Some symptoms cannot wait for an office visit. Based on CDC guidance, get medical care right away, or call 911, if your child has:

• Fast breathing or trouble breathing
• Bluish lips or face
• Ribs pulling in with each breath
• Chest pain
• Severe muscle pain, such as refusing to walk
• Signs of dehydration: no urine for 8 hours, a dry mouth, or no tears when crying
• Not being alert or interacting when awake
• A seizure
• A fever above 104°F that does not come down with fever medicine
• Any fever in a baby younger than 12 weeks
• A fever or cough that improves but then returns or gets worse
• A chronic medical condition that suddenly gets worse

Pauses in breathing in a young baby are also an emergency. Do not drive while trying to watch a child who is struggling to breathe. Call 911.

Pediatrician, Urgent Care, or Emergency Room?

Choosing the right place saves time and stress. Your pediatrician is the best first call for most illnesses during flu and RSV season. We know your child’s history and can arrange follow-up care. Urgent care can help after hours with minor problems. The emergency room is for the warning signs listed above.

For a deeper look at this decision, read our guide on when to take your child to the doctor versus urgent care in Chicago.

School, Daycare, and Sports: When Can Your Child Go Back?

Chicago schools and daycares share illnesses quickly, so a careful return protects your child and their classmates. A good general rule: your child can return when they have been fever-free for at least 24 hours without fever-reducing medicine, and their symptoms are getting better overall.

A mild leftover cough or runny nose is common for a week or two and does not always mean your child is still contagious. Check your school’s or daycare’s own policy, because some programs have stricter rules. If your child needs a note to return, we can provide one after a visit.

For sports, let your child ease back in. After the flu, energy can stay low for a week or more. If your child feels short of breath, has chest pain, or seems unusually tired during practice, stop and call us.

Respiratory Season and Children With Asthma

Viruses are one of the most common triggers of asthma flare-ups. The flu, in particular, can turn a mild cough into a serious asthma attack. If your child has asthma, take a few extra steps before winter:

• Make sure your child gets the flu vaccine every year.
• Check that inhalers and spacers are not expired, and keep one at school.
• Review your child’s asthma action plan with us, and share a copy with the school nurse.
• Start the plan early when cold symptoms appear, instead of waiting for wheezing.

Cold Chicago air can also tighten the airways. A scarf or face covering over the nose and mouth on very cold days warms the air before it reaches the lungs.

How ASB Medical Clinic Helps Families Through Flu and RSV Season

ASB Medical Clinic is a private pediatric practice at 6033 Irving Park Rd, Chicago, IL 60634. Dr. Anna Banas has cared for Chicago children from birth through the teen years since 1994. During respiratory season, families rely on us for:

• Flu shots for children of all ages
• Same-day sick visits when you call early
• Questions about RSV protection for newborns and infants
• Asthma action plans and follow-up care
• School and daycare return notes
• Visits in English, Polish, Spanish, and Russian

Our office hours are Monday through Friday, 9 AM to 5 PM, and two Saturdays each month, 9 AM to 5 PM. Call (773) 777-4767 or request an appointment online.

Frequently Asked Questions

When is flu and RSV season in Chicago?

Flu and RSV activity in Chicago usually rises in October and November, peaks between December and February, and drops in March and April. The timing changes a little every year, so it is best to prepare in early fall.

Is it too late to get my child a flu shot in December or January?

No. Flu often spreads into spring, so getting the vaccine later in the season still protects your child. Earlier is better, especially for children who need two doses.

How can I tell if my baby has RSV or just a cold?

You often cannot tell at first, because RSV starts like a cold. Watch for fast or hard breathing, wheezing, poor feeding, fewer wet diapers, or pauses in breathing. Call us if you see any of these signs.

Should my child stay home with a runny nose?

A runny nose alone, without fever, usually does not require staying home. Keep your child home if they have a fever, feel too sick to take part in class, or have a cough that disrupts the day.

Can my child get the flu even after a flu shot?

Yes, but the illness is usually milder. The flu vaccine lowers the chance of severe illness, hospital stays, and complications like pneumonia.

Do you offer same-day appointments for sick children?

Yes. Same-day sick visits are often available when families call early in the day. Call (773) 777-4767 to check availability.

Flu and RSV season in Chicago does not have to catch your family off guard. With a yearly flu shot, healthy habits, and a clear plan for when to call, you can help your child through the winter safely. If you have questions about your child’s health this season, our team is here to help.

This article is for informational purposes only and does not constitute medical advice.