Does teething cause fevers and diarrhea?

Teething may cause mild fussiness and drooling but doesn’t cause high fever, severe diarrhea, or widespread rashes. Those signs point to infection.

How often do babies get sick in daycare?

Daycare illness frequency is higher than home care—especially in the first 3–6 months—then tends to improve by year 2. Expect multiple viral infections per year in group care, with variability by season and exposures (AAP Red Book; BMJ Open cohort).

Are antibiotics helpful for most daycare colds?

No. Most respiratory infections are viral, so antibiotics don’t help and can cause side effects and resistance. Your clinician may use antibiotics for bacterial infections (e.g., some ear infections, strep) based on exam and age.

Do probiotics prevent daycare infections?

Some studies suggest probiotics may slightly reduce duration or frequency of certain GI illnesses, but evidence is mixed and strain-specific. Ask your pediatrician before starting supplements.

How long is my baby contagious?

Often most contagious early in the illness and while feverish. Many respiratory viruses can shed for several days; norovirus can shed for days after recovery. Follow AAP exclusion guidance and your daycare’s policy.

How often should I clean toys?

Clean and sanitize mouthed toys daily or between users; clean high-touch surfaces at least daily and after visible soiling. (CDC cleaning guidance)

Will this ever get better?

Yes. Research shows an initial spike after enrollment with gradual improvement over months, and many families report far fewer illnesses by the second year in care (BMJ Open; AAP).

Baby Sick After Starting Daycare? What to Expect (6–12 Months)

Baby Sick After Starting Daycare? What to Expect 6–12m

If your little one seemed healthy—and then got sick right after starting daycare—you’re not imagining it. The sudden “daycare plague” is a very real pattern many families face, especially when babies begin group care between 6 and 12 months.

Key takeaway: A spike in colds and stomach bugs is common in the first months after daycare enrollment, then improves over time as your baby’s immune system matures.

In this guide, you’ll learn why illness is more frequent after enrollment, what the research says about timelines, the American Academy of Pediatrics (AAP) sick-day policy, proven prevention steps in childcare, what you can do at home, vaccines that help, and when to call the pediatrician.

Why Illness Spikes After Enrollment (6–12 Months)

Several biology-and-environment factors collide when a baby starts daycare:

Immune system in transition: By 6–12 months, maternal antibodies from pregnancy and chestfeeding are waning while your baby’s adaptive immune system is still learning to recognize and fight new germs.
High-contact environment: Infants are in close quarters with peers and caregivers. Shared surfaces, high-touch objects, and frequent caregiving tasks (feeding, diapering) raise exposure.
Mouthing behaviors: Babies explore the world with their mouths, which accelerates germ transfer from toys and hands.
More pathogens in circulation: Group settings naturally collect more respiratory and gastrointestinal viruses than a single household.

These dynamics explain the jump in daycare sickness after enrollment and why preventing illness in daycare requires consistent, layered strategies.

What the Research Shows: How Often and How Long It Lasts

A prospective birth cohort in BMJ Open found children starting center-based care had a marked rise in respiratory symptoms—from about 3.8 days/month before enrollment to 10.6 days/month within two months—followed by a gradual decline over the next nine months (Schuez-Havupalo et al., 2017) [BMJ Open]. This aligns with what many parents see: the first 3–6 months are the rockiest, with improvement by year 2.
Pediatric sources note that young children commonly experience multiple infections annually, with those in group care at the higher end; center-based care is consistently linked with more respiratory and gastrointestinal illnesses than home care (AAP Red Book; HealthyChildren.org).

What to expect: The first 3–6 months after starting daycare often bring back-to-back viral colds and the occasional stomach bug. Most families see fewer, milder illnesses as the second year in care begins.

Citations: BMJ Open cohort study on daycare and respiratory infections (2017); AAP Red Book guidance on group child care; HealthyChildren.org on illness management in child care.

Common Daycare Infections in Infants and Key Symptoms

Respiratory infections

Common cold (rhinoviruses, others): Runny or stuffy nose, sneezing, cough, mild fever, decreased appetite. Symptoms peak around days 2–3 and improve by days 7–10.
RSV/bronchiolitis: Starts like a cold, then can progress to fast or labored breathing, wheezing, and difficulty feeding—highest risk in infants under 12 months. Seek care for breathing difficulty or dehydration. (CDC: RSV)
Influenza (flu): Fever, body aches, cough, sore throat, fatigue; can lead to complications in infants. Annual vaccination (starting at 6 months) is key. (CDC: Influenza)

Gastrointestinal (GI) infections

Norovirus: Sudden onset vomiting and diarrhea; very contagious, spreads via hands, surfaces, and food. Hydration is the priority.
Rotavirus: Watery diarrhea, vomiting, fever, and abdominal pain; vaccination in infancy greatly reduces severe disease. (CDC: Rotavirus)

Dehydration signs (seek care if present)

Fewer wet diapers (fewer than 3–4 in 24 hours)
No tears when crying, dry mouth or lips
Sunken soft spot (fontanelle), unusual sleepiness or lethargy
Fast breathing or rapid heart rate

When to Keep Your Baby Home: Clear AAP Criteria

The AAP’s illness-exclusion guidance, summarized on HealthyChildren.org, helps families and programs make consistent decisions. Always follow your daycare’s policy, which should align with AAP recommendations.

Keep your child home and consult your provider or the daycare when your baby has:

Fever with behavior change or symptoms (e.g., cough, rash, sore throat, vomiting, diarrhea). Many programs use: 101°F (38.3°C) or higher. Babies must be fever-free for 24 hours without fever reducers and have improving symptoms before returning. (AAP/HealthyChildren.org)
Vomiting: 2 or more episodes in 24 hours (unless a noninfectious cause is clear and the child is well-hydrated). (AAP)
Diarrhea: Stools that can’t be contained in the diaper; more than two above normal frequency; or blood/mucus in stool. (AAP)
Breathing difficulties (fast breathing, retractions, nasal flaring, wheezing), or any signs of respiratory distress. (AAP)
Severe illness behaviors: Unusually sleepy, irritable, or not acting like themselves; unable to comfortably participate; needs more care than staff can provide. (AAP)
Rash with fever or behavior change until a communicable cause is ruled out. (AAP)
Mouth sores with drooling (unless a clinician says noninfectious). (AAP)
Weeping skin sores that can’t be adequately covered. (AAP)

Special age note: Any fever of 100.4°F (38.0°C) or higher in infants under 3 months warrants immediate medical evaluation. (AAP)

Source: HealthyChildren.org—When to Keep Your Child Home From Child Care; AAP Red Book (group child care guidance).

Proven Prevention in Childcare Settings (CDC/WHO)

The most effective programs use layered controls and audit them regularly. Ask your daycare how they implement these CDC- and AAP-aligned practices:

Rigorous hand hygiene: Staff and children wash with soap and water for 20 seconds on arrival; before/after meals; after diapering/toileting; after outdoor play; after coughing/sneezing or handling bodily fluids. Alcohol-based sanitizer (≥60% alcohol) is a backup when hands aren’t visibly soiled. (CDC ECE Portal; WHO hand hygiene)
Cleaning, sanitizing, and disinfecting: Clear schedules and checklists for high-touch surfaces, cribs, mats, doorknobs; immediate disinfection of diapering areas; and sanitizing toys that go in mouths after each use or daily. (CDC: How to Clean and Disinfect ECE Settings)
Toy rotation and soiled-toy bins: Separate mouthed toys until cleaned and sanitized. (CDC)
Ventilation and air quality: Fresh air exchanges, open windows when feasible, and well-maintained HVAC with regular filter changes. (CDC ECE)
Meticulous diapering protocols: Handwashing before/after, gloves, liner protection, and disinfection of changing areas each time. (AAP/CDC)
Smaller group sizes and lower ratios: Especially in infant rooms, this supports better hygiene oversight and reduces exposure networks. (AAP Red Book)
Staff training and audits: Ongoing infection-control training; leadership spot checks; transparent logs parents can review. (CDC ECE)

How to confirm it’s real, not just on paper:

Ask to see cleaning and toy-sanitizing logs and diapering procedures.
Observe handwashing after diaper changes and before feeding.
Ask how they monitor ventilation (e.g., filter schedule, CO₂ monitoring, window policies).
Review their written sick policy and how it’s enforced (who decides, how return-to-care is verified, outbreak communications).

What Parents Can Do at Home to Cut the Cycle

You can’t (and shouldn’t) sterilize life, but you can lower risk:

Build handwashing habits: Wash your hands and your baby’s hands (or wipe with a clean, damp cloth) after daycare pickup, before meals, after diaper changes, and after nose-wiping.
Clean high-touch items: Regularly clean pacifiers, teethers, and toys your baby mouths; wipe down doorknobs, light switches, and phones—especially during active illness. (CDC cleaning guidance)
Limit exposure from sick contacts: Encourage sick siblings and adults to practice cough etiquette, wear a mask around baby if feasible, and avoid sharing cups/utensils.
Support sleep and nutrition: Adequate sleep and balanced nutrition (breastmilk or formula plus age-appropriate solids) help immune resilience.
Saline and suction for colds: Saline drops and a nasal aspirator before feeds/sleep can ease congestion. Use a cool-mist humidifier and clean it regularly.
Realistic expectations about teething: Teething may cause drooling and mild fussiness, but it doesn’t cause high fever, severe diarrhea, or rashes that spread. If those occur, think infection first.

Vaccines That Protect in Daycare

Vaccination reduces the risk of severe disease, complications, and outbreaks in group settings. Keep your child up to date per your pediatrician and local guidance:

Routine infant vaccines: DTaP, Hib, PCV, IPV (polio), HepB, and rotavirus in the first year. Rotavirus vaccine significantly cuts severe diarrheal illness. (CDC; AAP)
Annual influenza vaccine: Recommended for everyone 6 months and older, with two doses the first season for vaccine-naïve children. (CDC Influenza)
COVID-19 vaccines: Recommended for children 6 months and older per current CDC/AAP guidance.

Keep a copy of your child’s immunization record for daycare; programs should track vaccine status per AAP Red Book and local regulations.

Choosing or Re‑Evaluating a Daycare for Health Safety

Use this health-safety checklist when touring or re-assessing your program:

Handwashing sinks in each room; visible soap and paper towels; posted handwashing steps
Diapering area separate from food prep; step-by-step diapering poster; disinfectant available and used every change
Written AAP-aligned illness exclusion policy and clear return-to-care criteria (fever-free 24 hours without meds; improving symptoms)
Cleaning/sanitizing logs for toys and high-touch surfaces; dedicated bin for soiled toys
Ventilation approach (windows, HVAC maintenance, filter schedule)
Group size and caregiver ratios appropriate for infants
Staff training frequency on infection control; who audits compliance and how often
Communication systems for daily health updates and outbreak notifications
Parent education materials from trusted sources (AAP/CDC/WHO)

Sources: AAP Red Book; HealthyChildren.org; CDC ECE Portal; CDC cleaning guidance.

Working‑Parent Realities: Planning for Inevitable Sick Days

It’s normal to feel stressed when work collides with illness. Planning helps:

Backup care network: Identify relatives, trusted friends, or vetted sitters who can cover on short notice.
Employer conversation: Proactively discuss flexible hours, remote options, and sick leave. Frame it as time-limited while your child adjusts to group care.
Sick‑day toolkit: Keep a thermometer, age-appropriate fever reducers (acetaminophen; ibuprofen if 6+ months—confirm dosing with your clinician), saline drops, nasal aspirator, cool‑mist humidifier, oral rehydration solution (ORS), extra pacifiers/teethers, and a symptom log.
Self‑compassion: You’re not causing the illnesses; you’re navigating a developmental and environmental transition the best you can.

When to Call the Pediatrician or Seek Urgent Care

Call your pediatrician promptly for:

Fever in infants 3–12 months that persists >24 hours, or any fever with a concerning rash, breathing issues, dehydration, ear pain, or if your baby seems very unwell. Immediate evaluation for any child under 3 months with fever ≥100.4°F (38.0°C). (AAP)
Breathing difficulties: Fast breathing, chest retractions, nasal flaring, grunting, bluish lips/skin—seek urgent care/ER.
Signs of dehydration: Very few wet diapers, dry mouth, sunken fontanelle, lethargy—seek care.
Persistent high fever: 102–104°F (38.9–40°C) not improving with comfort measures, or lasting >3 days.
Worsening symptoms after initial improvement, or symptoms not improving by day 10 for a cold.
Ear pain or tugging, notable fussiness, or sleep disruption that could indicate an ear infection.

Home care is reasonable for mild colds and single-day stomach bugs if your baby is breathing comfortably, feeding adequately, and making wet diapers. When in doubt, call your pediatrician or nurse advice line.

Sources: HealthyChildren.org (When to Keep Your Child Home); AAP Red Book; CDC RSV/Flu.

FAQs and Myths: Teething, Antibiotics, Probiotics, and More

Does teething cause fevers and diarrhea? Teething may cause mild fussiness and drooling but doesn’t cause high fever, severe diarrhea, or widespread rashes. Those signs point to infection.
How often do babies get sick in daycare? Daycare illness frequency is higher than home care—especially in the first 3–6 months—then tends to improve by year 2. Expect multiple viral infections per year in group care, with variability by season and exposures (AAP Red Book; BMJ Open cohort).
Are antibiotics helpful for most daycare colds? No. Most respiratory infections are viral, so antibiotics don’t help and can cause side effects and resistance. Your clinician may use antibiotics for bacterial infections (e.g., some ear infections, strep) based on exam and age.
Do probiotics prevent daycare infections? Some studies suggest probiotics may slightly reduce duration or frequency of certain GI illnesses, but evidence is mixed and strain-specific. Ask your pediatrician before starting supplements.
How long is my baby contagious? Often most contagious early in the illness and while feverish. Many respiratory viruses can shed for several days; norovirus can shed for days after recovery. Follow AAP exclusion guidance and your daycare’s policy.
How often should I clean toys? Clean and sanitize mouthed toys daily or between users; clean high-touch surfaces at least daily and after visible soiling. (CDC cleaning guidance)
Will this ever get better? Yes. Research shows an initial spike after enrollment with gradual improvement over months, and many families report far fewer illnesses by the second year in care (BMJ Open; AAP).

The Bottom Line

Frequent colds and the occasional GI bug after daycare enrollment are frustrating—but common and temporary. Layered prevention in the classroom, smart habits at home, and staying current on vaccines meaningfully reduce risk and severity. Follow AAP daycare sick policy for exclusion and return, and call your pediatrician when red flags arise.

You’re doing a great job. This phase is hard, but it’s also a sign your baby’s immune system is learning—and it gets easier.

If you’re choosing a program or re‑evaluating one, use the checklist above and don’t hesitate to ask to see real practices in action. For personalized guidance about your baby’s symptoms or vaccine schedule, reach out to your pediatrician.

References (accessed 2024):

Schuez‑Havupalo L. Daycare attendance and respiratory tract infections: a prospective birth cohort study. BMJ Open. 2017. https://pmc.ncbi.nlm.nih.gov/articles/PMC5588939/
HealthyChildren.org (AAP). When to Keep Your Child Home From Child Care (2024). https://www.healthychildren.org/English/family-life/work-and-child-care/Pages/when-to-keep-your-child-home-from-child-care.aspx
AAP Red Book. Children in Group Child Care and Schools. https://publications.aap.org/redbook/book/347/chapter/5749564/Children-in-Group-Child-Care-and-Schools
CDC Early Care and Education Portal: Preventing Infectious Diseases (2024). https://www.cdc.gov/early-care/prevention/index.html
CDC. How To Clean and Disinfect Early Care and Education Settings (2024). https://www.cdc.gov/hygiene/about/how-to-clean-and-disinfect-early-care-and-education-settings.html
WHO. Child Health and Development. https://www.who.int/teams/maternal-newborn-child-adolescent-health-and-ageing/child-health
Churchill RB. Infection Control Challenges in Child-Care Facilities. Pediatr Infect Dis J. 2005. https://pmc.ncbi.nlm.nih.gov/articles/PMC7134869/

This article is for general education and is not a substitute for medical advice from your child’s clinician.