Fevers, Ear Infections, and Teeth: A Preschool Health Primer

In one minute

• A fever up to 104°F (40°C) isn't dangerous by itself — treat for comfort, not to chase a number.
• Colds and ear infections are extremely common at this age; not every ear infection needs an antibiotic right away.
• A pea-sized amount of fluoride toothpaste (a rice-grain smear is the right amount for kids under 3, if you have a younger one too) plus regular dental visits protects teeth through the years when cavity risk is highest.
• About 1 in 5 preschoolers deals with constipation, and most cases improve with more fiber, fluids, and a relaxed bathroom routine.

Fever: what the number does (and doesn't) mean

It's one of the most persistent parenting fears, but the evidence is reassuring: fevers up to 104°F on their own don't cause brain damage, and fever-reducing medicine doesn't prevent febrile seizures. Fever is often just your child's immune system doing its job. Treat to keep your child comfortable — offer fluids, dress lightly, use medication if they're miserable — rather than watching the thermometer. If you use a fever reducer, acetaminophen or ibuprofen for comfort is reasonable — ask your pediatrician which one and how much for your child's current weight, and never guess or reuse an older sibling's dose. Never give aspirin to a child with a fever; it's linked to Reye's syndrome, a rare but serious condition. Don't alternate or combine two fever reducers unless your pediatrician has specifically told you to.

Ears, teeth, and the everyday stuff

By age 3, most kids have had at least one ear infection, and colds remain the most common illness at this age. For milder ear infections — lower fever, child otherwise okay — many pediatricians recommend a short watch-and-wait period with close follow-up rather than antibiotics right away, since overuse contributes to resistance. This is a call your pediatrician makes with you, after actually examining the ear — it isn't something to decide at home, and if antibiotics are prescribed, finish the full course even once your child seems better. On the dental side, this is peak cavity-risk territory: keep using a pea-sized amount of fluoride toothpaste, spit rather than rinse, and stick with checkups roughly every six months.

About constipation

If bathroom time has become a battle, you're not alone — roughly 1 in 5 preschoolers deals with functional constipation, often tied to low fiber or fluid intake, or plain toileting anxiety. Most cases respond well to more fiber-rich foods, more fluids (roughly four cups a day is a common target, but ask your pediatrician what's right for your child), and a calm, unhurried toilet routine.

When to call your pediatrician: call or seek urgent care for any of these, at any temperature: severe lethargy or difficulty waking, a stiff neck, a rash that doesn't fade when pressed, trouble breathing, or a child who looks very unwell. Also call for a fever of 104°F or higher, a fever that persists beyond three days, ear pain with drainage from the ear, a cough lasting more than three weeks, no bowel movement for 4-5 days despite diet changes, hard or painful stools, blood on the stool or paper, belly pain, a toilet-trained child who starts having soiling accidents, dark spots or pain on your child's teeth, or signs of dehydration (no wet diaper or urination in 8+ hours, no tears when crying, a dry mouth).

Sources

1. American Academy of Pediatrics (2011, reaffirmed). Fever and antipyretic use in children. https://publications.aap.org/pediatrics/article/127/3/e20103852/65016/Fever-and-Antipyretic-Use-in-Children
2. Cross-sectional study. Prevalence of common infections in preschool-age children. https://pmc.ncbi.nlm.nih.gov/articles/PMC10807262/
3. American Academy of Pediatrics (2024). All about fluoride: updated clinical report. https://publications.aap.org/aapnews/news/7429/All-about-fluoride-Updated-clinical-report-covers
4. Cohort study, Japan. Functional constipation in preschool-age children. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5848140/