Last updated: October 2026
Most stuffy, drippy noses in kids are colds, and colds clear on their own. A sinus infection in kids usually starts as a cold, then follows one of three patterns: symptoms that drag past 10 days without improving, symptoms that get better and then suddenly worse, or a severe start with a fever of 102.2 F or higher plus thick nasal discharge for 3 or more days. If your child fits one of those three, it is time for a pediatrician to take a look.
Every parent in Marietta or Alpharetta knows the fall routine. School starts, the first cold arrives, and by week two you are wondering whether this is still “just a cold.” Here is how to tell.
Key takeaways
- Colds peak around day 3 to 5 and fade by day 7 to 10. Sinus infections linger, rebound, or start severe.
- Green or yellow mucus by itself is normal in a cold and does not mean your child needs antibiotics.
- Saline, fluids, a cool-mist humidifier, and rest handle most cases. Antibiotics are for confirmed bacterial sinusitis.
- Swelling around the eyes, a severe headache, a stiff neck, or high fever means a same-day visit.
How do I know if my child has a sinus infection or just a cold?
Watch the timeline, not the mucus. A cold peaks early and improves by itself. A bacterial sinus infection either refuses to improve, improves and then rebounds, or starts out unusually severe.
The American Academy of Pediatrics uses three patterns to tell them apart. The first is persistent symptoms: a runny nose, daytime cough, or both for more than 10 days without improvement. The second is worsening: new fever or a worse runny nose and cough after the child had started to get better. The third is severe onset: a fever of 39 C (102.2 F) or higher with thick nasal discharge for more than 3 days in a row. [Source: American Academy of Pediatrics 2013]
Colds, by contrast, are short. The AAP notes that colds usually last about 7 days, and that fever with a cold is rare and tends to show up only at the start. [Source: HealthyChildren.org 2024]
| What you notice | Common cold | Bacterial sinus infection |
|---|---|---|
| How long it lasts | Peaks day 3 to 5, better by day 7 to 10 | More than 10 days with no improvement |
| Pattern | Steady improvement after the peak | Gets better, then suddenly worse |
| Fever | Rare, low grade, early in the illness | 102.2 F or higher for 3 or more days with thick discharge |
| Mucus color | Clear, then yellow or green around day 3 to 4, then clearing | Thick and discolored for 3 or more days without clearing |
| Face and eyes | No facial pain | Headache behind the eyes, puffiness under the eyes in the morning |
| Breath | Normal | Persistent bad breath with cold symptoms |
Those extra sinus signs, like a headache that gets worse when your child bends over or dark circles under the eyes in the morning, are listed by the AAP as clues that a cold has turned into sinusitis. If your child has had several ear infections in the past, the same cold viruses are often the trigger, and the same timing rules apply.
Does green mucus mean my child needs antibiotics?
No. Green or yellow mucus is a normal stage of a cold, not proof of a bacterial infection.
The AAP puts it plainly: yellow or green mucus in the nose does not automatically mean that antibiotics are needed, and that discoloration is most often from a viral infection that can last up to 10 days. [Source: HealthyChildren.org 2024] The color comes from immune cells doing their job, not from the type of germ.
What matters is the combination of thick discharge plus duration plus fever. Thick discharge for 3 or more days alongside a fever of 102.2 F or higher is one of the three patterns above. Thick discharge for two days in a child who is otherwise perking up is just a cold doing cold things.
Giving antibiotics for a virus does nothing for the illness and adds side effects like upset stomach and rash. The CDC notes that most sinus infections get better on their own without antibiotics, and that a provider may suggest waiting 2 to 3 days to see whether antibiotics are truly needed. [Source: CDC 2024] Our post on antibiotics for children explains when they help and when they do not.
How can I treat my child’s sinus infection at home?
Thin the mucus, keep your child hydrated, moisten the air, and let them rest. Those four steps relieve most sinus symptoms whether the cause is a virus or bacteria.
Saline is the workhorse. Saline nose drops or spray thin the mucus so it drains. For babies and toddlers, a few drops followed by gentle bulb suction clears what they cannot blow out. The AAP’s homemade recipe is 1/2 teaspoon of salt in 1 cup (8 ounces) of water, boiled for 15 minutes and cooled before use. [Source: HealthyChildren.org 2024] Store-bought saline is just as good and simpler.
Fluids keep mucus loose. Water, milk, diluted juice, and warm soup all count. Kids who are congested often drink less, so offer small amounts often and watch for signs of dehydration. A cool-mist humidifier in the bedroom adds moisture to the air, which matters once the furnace kicks on in a Cobb County home. Clean it as the manufacturer recommends so it does not grow mold.
A warm washcloth across the cheeks and forehead for a few minutes eases sinus pressure. For pain or fever, ask your pediatrician which over-the-counter medicine fits your child’s age and weight. Never give aspirin to a child. The CDC advises against over-the-counter cough and cold medicines for children under 4 unless a provider specifically says to use them. [Source: CDC 2024]
When does a sinus infection in kids need antibiotics?
Antibiotics are used when a child meets one of the three bacterial patterns and the pediatrician confirms the diagnosis. Even then, waiting a few days is sometimes the right call.
For the persistent pattern (more than 10 days, no improvement), the AAP allows either antibiotics or 3 days of watchful waiting with a plan to follow up. If symptoms improve within 72 hours on their own, no antibiotic is given. For the worsening or severe patterns, antibiotics are usually started right away. [Source: American Academy of Pediatrics 2013]
Bacterial sinusitis is not rare in children. An NIH review reports that children average more than 6 upper respiratory infections a year, and roughly 6% to 13% of those viral colds progress to a bacterial sinus infection. [Source: NIH StatPearls 2023] That is why your pediatrician takes the day count seriously.
Once an antibiotic is prescribed, finish it. Your child should start feeling better within 2 to 3 days. Stopping early because they look fine can let the infection come back. The AAP warns that ending the antibiotic early could cause the infection to return. [Source: HealthyChildren.org 2024] If there is no improvement after 2 to 3 days on the medicine, call the office. A different antibiotic or a closer look may be needed. A quick rapid test for strep, flu, RSV, and COVID can also rule out look-alike illnesses during the same visit.
What are the warning signs of a serious sinus infection?
A few symptoms mean the infection may be spreading beyond the sinuses. These need a same-day visit, and a few of them need the emergency department.
The AAP lists these as reasons to call the pediatrician right away: swelling or redness around the eyes that lasts all day (not just morning puffiness), a severe headache or pain in the back of the neck, persistent vomiting, sensitivity to light, and increasing irritability. [Source: HealthyChildren.org 2024]
Add these to the list: a stiff neck, a fever that stays high or returns after going away, a child who is hard to wake or unusually sleepy, and cold symptoms that are still going strong past 10 days. Serious complications are uncommon, about 1 in every 1,000 cases according to the NIH, and most of those involve the tissue around the eye. [Source: NIH StatPearls 2023] Rare does not mean never, so eye swelling always gets checked the same day.
If you are unsure whether a fever is a problem, our guide to child fever and when to worry walks through it by age.
When is sinus infection season in Georgia?
Sinus infections follow colds, so they spike in North Atlanta from October through February and show up again with spring pollen. Summer is the quiet season.
Cold viruses circulate all year, but the AAP notes rhinovirus infections are most common during the fall and spring, and that most children have about 8 to 10 colds in their first 2 years of life. [Source: HealthyChildren.org 2024] Each of those colds is a chance for the sinuses to get blocked and infected.
In Forsyth County and across the metro, fall and winter bring back-to-back colds from school and daycare, plus dry heated indoor air that thickens mucus. Then March arrives and the pine and oak pollen coats everything. Seasonal allergies in Georgia kids swell the nasal lining and block drainage, which sets up the same trapped-mucus problem a cold does. Kids with asthma or allergies are often the ones who get sinus infections in April and May.
A yearly flu shot, handwashing, and keeping allergies controlled lower the number of colds and, with them, the number of sinus infections.
How a pediatrician can help with sinus infections
A pediatrician can tell a lingering cold from a bacterial sinus infection in one visit, usually with nothing more than a history and an exam. No X-rays or blood work are needed in most cases.
Our four North Atlanta offices offer same-day sick visits every day, so a child who hits day 10 on a Tuesday can be seen that Tuesday. If you are weighing whether an in-person visit is needed, a secure video visit lets a pediatrician review the timeline, see your child, and decide with you. Weekend symptoms are covered by our Saturday clinic.
Every physician on our team is board certified and cares for children from birth through age 18. Families in Marietta, East Cobb, Alpharetta, and Cumming can choose the office closest to home.
Frequently asked questions about sinus infections in kids
Can a 2 year old get a sinus infection?
Yes. The sinuses behind the cheeks and between the eyes are present at birth, so toddlers and even babies can develop sinusitis after a cold. The frontal sinuses in the forehead do not form until around age 7, which is why younger kids rarely complain of forehead pain. In toddlers, the main clue is time: a runny nose and daytime cough that pass the 10-day mark without getting better. Toddlers cannot describe pressure or headache, so parents should watch the calendar, the fever, and whether the child is drinking and sleeping normally.
Is a sinus infection contagious?
The sinus infection itself is not contagious, but the cold virus that started it is. Siblings and classmates can catch the cold, and a small share of them will go on to develop their own sinus infection. Handwashing, covering coughs, and keeping a sick child home while they have a fever all reduce spread. Once your child has been on antibiotics for a bacterial sinus infection for 24 hours and is fever free, they are generally fine to return to school or daycare if they feel well enough.
How long does a sinus infection last in a child?
Untreated viral sinusitis usually clears within 10 to 14 days as the cold runs its course. Bacterial sinusitis treated with antibiotics typically improves within 2 to 3 days of the first dose, though the full course is longer and the cough can linger for a week or two after. Chronic sinusitis is defined as symptoms lasting 3 months or longer and is much less common in children. If your child seems to get one sinus infection after another, mention it at the next wellness visit so allergies, enlarged adenoids, or other causes can be checked.
Should I keep my child home from school with a sinus infection?
Keep them home while they have a fever, are too tired to participate, or are coughing and sneezing enough to spread germs. A child with mild congestion, no fever, and normal energy can usually attend. Send a water bottle and tissues, and let the teacher know. Daycare and preschool often have their own rules about fever-free windows, usually 24 hours, so check the policy before sending a younger child back.
The bottom line on sinus infections in kids
Count the days, watch the pattern, and ignore the mucus color. A cold improves on its own by day 7 to 10. Anything that lingers past 10 days, rebounds after improving, or starts with a high fever and thick discharge deserves a pediatrician’s eyes. If you are not sure which one your child has, we are happy to sort it out. Request an appointment at any of our four North Atlanta offices or call (678) 501-5601.
This article is for general information and is not medical advice. Contact your pediatrician for care specific to your child.
