How Often Do Babies Get Sick? What's Normal
Medically reviewed by Dr. Michael Okonkwo, MD, FAAP · Board-Certified Neonatologist
Content reviewed against published AAP, CDC, NIH guidelines
Last reviewed:
If your baby has been diagnosed with or you suspect how often do babies get sick? what's normal, here is what the evidence says.
The short answer
It is normal for babies and toddlers to get 6-8 upper respiratory infections (colds) per year, and children in daycare may have even more — up to 8-12 illnesses annually. According to the AAP, the average child will have experienced 80-100 viral infections by their 6th birthday. Babies in group childcare settings tend to get sick more frequently in their first 1-2 years (often called the "germ year") but research shows they have fewer infections in later childhood compared to children who were not in early group care, as their immune systems were exposed sooner. Each cold typically lasts 7-10 days, and with back-to-back infections, it can feel like your baby is sick continuously through the fall and winter months. This frequent illness, while exhausting for families, is a normal part of immune system development.
Key takeaways
- It is normal for babies and toddlers to get 6-8 upper respiratory infections (colds) per year, and children in daycare may have even more — up to 8-12 illnesses annually. According to the AAP, the average child will have experienced 80-100 viral infections by their 6th birthday. Babies in group childcare settings tend to get sick more frequently in their first 1-2 years (often called the "germ year") but research shows they have fewer infections in later childhood compared to children who were not in early group care, as their immune systems were exposed sooner. Each cold typically lasts 7-10 days, and with back-to-back infections, it can feel like your baby is sick continuously through the fall and winter months. This frequent illness, while exhausting for families, is a normal part of immune system development.
- Usually normal when: Baby getting 6-8 or more colds per year, especially in fall and winter
- Call your doctor if: Fever of 100.4°F (38°C) or higher in a baby under 3 months — requires immediate evaluation
- Varies by age — see the age-by-age breakdown below
“Fever itself is not an illness — rather, it is a sign or symptom that the body is fighting an infection. Fever stimulates certain defenses, such as the white blood cells, which attack and destroy invading bacteria.”
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What Parents Should Know
According to AAP, CDC, NIH guidelines, it is normal for babies and toddlers to get 6-8 upper respiratory infections (colds) per year, and children in daycare may have even more — up to 8-12 illnesses annually. According to the AAP, the average child will have experienced 80-100 viral infections by their 6th birthday. Babies in group childcare settings tend to get sick more frequently in their first 1-2 years (often called the "germ year") but research shows they have fewer infections in later childhood compared to children who were not in early group care, as their immune systems were exposed sooner. Each cold typically lasts 7-10 days, and with back-to-back infections, it can feel like your baby is sick continuously through the fall and winter months. This frequent illness, while exhausting for families, is a normal part of immune system development. At 0-3 months, newborns have some protection from maternal antibodies (passed through the placenta and breast milk), so they tend to get fewer infections in the first 2-3 months. However, any fever of 100.4°F (38°C) or higher in a baby under 3 months requires immediate medical evaluation because their immune system cannot reliably fight bacterial infections. Most pediatricians recommend limiting exposure to crowds and sick contacts during this period. It is generally considered normal when baby getting 6-8 or more colds per year, especially in fall and winter. However, you should contact your pediatrician promptly if fever of 100.4°F (38°C) or higher in a baby under 3 months — requires immediate evaluation.
Normal vs. Concerning
When to Seek Immediate Care
- Fever of 100.4°F (38°C) or higher in a baby under 3 months — requires immediate evaluation
- Difficulty breathing, persistent high fever over 104°F (40°C), or signs of dehydration
- Unusual or severe infections (pneumonia, deep skin infections, recurrent thrush after infancy) that may suggest immune deficiency
By Age
What to expect by age
0-3 months
Newborns have some protection from maternal antibodies (passed through the placenta and breast milk), so they tend to get fewer infections in the first 2-3 months. However, any fever of 100.4°F (38°C) or higher in a baby under 3 months requires immediate medical evaluation because their immune system cannot reliably fight bacterial infections. Most pediatricians recommend limiting exposure to crowds and sick contacts during this period.
3-6 months
Maternal antibodies begin to wane while the baby's own immune system is still immature. This creates a vulnerability window where babies become more susceptible to infections. If your baby starts daycare during this period, expect the first illness within 2-4 weeks. First colds can be alarming — nasal congestion sounds dramatic in small babies. Most viral illnesses are self-limiting and manageable with saline drops, suctioning, and adequate feeding.
6-12 months
This is often the peak illness period, especially for daycare-attending babies. A baby may have a cold every 2-3 weeks during fall and winter, with each cold lasting 7-10 days, creating the impression of being sick constantly. The baby's immune system is actively building its library of pathogen recognition. Ear infections are common secondary complications, affecting about 75% of children by age 3. Breastfeeding continues to provide some immune support during this time.
12-24 months
Illness frequency typically remains high but toddlers usually recover faster and handle infections with less distress. Studies show that children who were in group care starting in infancy tend to have fewer absences from school later due to illness. The immune system has now been exposed to many common viruses. However, each new germ encountered will still cause illness — the first exposure to RSV, hand-foot-mouth disease, or stomach bugs can feel severe even in an otherwise resilient toddler.
What to Tell Your Pediatrician
- Describe when you first noticed how often do babies get sick? what's normal and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if baby has had more than 8 ear infections in a year (may warrant ENT referral).
- Mention if infections consistently require antibiotics rather than resolving on their own.
- Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
- Bring a list of any questions or observations you want to discuss at the appointment.
What Should You Do?
When to take action
- Baby getting 6-8 or more colds per year, especially in fall and winter
- Each cold lasting 7-10 days with lingering cough for up to 2 weeks
- Seeming to be sick "all the time" during the first year of daycare
- Mild fevers (under 102°F/38.9°C) accompanying viral illnesses with good feeding and activity
- Runny nose that persists for weeks during cold season
- Baby has had more than 8 ear infections in a year (may warrant ENT referral)
- Infections consistently require antibiotics rather than resolving on their own
- Baby is not gaining weight well due to frequent illness
- You are concerned about a possible immunodeficiency due to unusual severity or frequency of infections
- Fever of 100.4°F (38°C) or higher in a baby under 3 months — requires immediate evaluation
- Difficulty breathing, persistent high fever over 104°F (40°C), or signs of dehydration
- Unusual or severe infections (pneumonia, deep skin infections, recurrent thrush after infancy) that may suggest immune deficiency
What You Can Do at Home
- Keep track of when you notice how often do babies get sick? what's normal — noting the time of day, duration, and any triggers can help your pediatrician.
- Remember that baby getting 6-8 or more colds per year, especially in fall and winter — this is generally within the range of normal.
- At 0-3 months, focus on observation rather than intervention unless your pediatrician advises otherwise.
- Follow any care instructions from your pediatrician. Keep a written log of symptoms to bring to appointments.
- While monitoring at home, seek immediate care if fever of 100.4°F (38°C) or higher in a baby under 3 months — requires immediate evaluation.
Related Conditions
Why Does My Baby Keep Getting Sick at Daycare?
It is completely normal for babies and toddlers in daycare to get 8-12 viral illnesses per year, and it can feel like they are sick constantly. This happens because young children have immature immune systems and are being exposed to many viruses for the first time. Each cold builds immunity, and studies show that children who attend daycare early have fewer illnesses when they start school (the illness burden shifts - you get them at daycare age or school age, but either way the total exposure is similar). While the frequency of illness is normal, it can be exhausting for families.
How Your Baby's Immune System Develops
Babies are born with an immature immune system that develops and strengthens throughout childhood. They receive some protective antibodies from their mother during pregnancy and through breast milk, but these gradually fade over the first 6 to 12 months. Every cold and virus your baby catches is actually training their immune system, and by age 7-8, most children have a mature, robust immune defense.
How Long a Cold Lasts in Babies
The common cold in babies typically lasts 7 to 10 days, though some symptoms like a residual cough or runny nose can linger for up to two weeks. Symptoms usually peak around days 2 to 3 and then gradually improve. Babies may catch 8 to 10 colds per year in their first two years, which is completely normal and helps build their immune system.
Related Resources
Frequently asked questions
Is how often do babies get sick? what's normal normal?
When should I call the doctor about how often do babies get sick? what's normal?
When is how often do babies get sick? what's normal normal?
What causes how often do babies get sick? what's normal?
What should I mention to my pediatrician about how often do babies get sick? what's normal?
Is how often do babies get sick? what's normal normal at 0-3 months?
Is how often do babies get sick? what's normal normal at 3-6 months?
Should I go to the ER for how often do babies get sick? what's normal?
Does how often do babies get sick? what's normal go away on its own?
References
Doctor Visit Checklist
Bring this checklist to your next pediatrician visit to discuss How Often Do Babies Get Sick? What's Normal.
Things to mention
- Describe when you first noticed how often do babies get sick? what's normal and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if baby has had more than 8 ear infections in a year (may warrant ENT referral).
- Mention if infections consistently require antibiotics rather than resolving on their own.
- Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
- Bring a list of any questions or observations you want to discuss at the appointment.
Observations to share
- Baby has had more than 8 ear infections in a year (may warrant ENT referral)
- Infections consistently require antibiotics rather than resolving on their own
- Baby is not gaining weight well due to frequent illness
Urgent signs to report immediately
- Fever of 100.4°F (38°C) or higher in a baby under 3 months — requires immediate evaluation
- Difficulty breathing, persistent high fever over 104°F (40°C), or signs of dehydration
- Unusual or severe infections (pneumonia, deep skin infections, recurrent thrush after infancy) that may suggest immune deficiency
My notes
From ismybabyalright.com — free, evidence-based baby health guides
All content follows our editorial policy and is reviewed against published clinical guidelines.
2,705 evidence-based guides6 authoritative medical sources5 medical advisory board members
Related Resources
Bottom line
Most cases of how often do babies get sick? what's normal are normal. Talk to your pediatrician if fever of 100.4°f (38°c) or higher in a baby under 3 months — requires immediate evaluation.
Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.
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Related Medical Concerns
Why Does My Baby Keep Getting Sick at Daycare?
It is completely normal for babies and toddlers in daycare to get 8-12 viral illnesses per year, and it can feel like they are sick constantly. This happens because young children have immature immune systems and are being exposed to many viruses for the first time. Each cold builds immunity, and studies show that children who attend daycare early have fewer illnesses when they start school (the illness burden shifts - you get them at daycare age or school age, but either way the total exposure is similar). While the frequency of illness is normal, it can be exhausting for families.
How Your Baby's Immune System Develops
Babies are born with an immature immune system that develops and strengthens throughout childhood. They receive some protective antibodies from their mother during pregnancy and through breast milk, but these gradually fade over the first 6 to 12 months. Every cold and virus your baby catches is actually training their immune system, and by age 7-8, most children have a mature, robust immune defense.
How Long a Cold Lasts in Babies
The common cold in babies typically lasts 7 to 10 days, though some symptoms like a residual cough or runny nose can linger for up to two weeks. Symptoms usually peak around days 2 to 3 and then gradually improve. Babies may catch 8 to 10 colds per year in their first two years, which is completely normal and helps build their immune system.
My Baby's Head Shape Looks Abnormal
Many babies develop temporary head shape irregularities that are completely normal. A cone-shaped head from vaginal delivery reshapes within days. Mild positional flattening (plagiocephaly) from sleeping on the back is very common and usually improves with repositioning and tummy time. However, head shape changes involving ridges, a persistently bulging fontanelle, or rapid head growth changes should be evaluated to rule out craniosynostosis.
Achondroplasia (Dwarfism) in Babies
Achondroplasia is the most common form of short-limbed dwarfism, affecting about 1 in 15,000 to 40,000 births. It is caused by a mutation in the FGFR3 gene and is usually apparent at birth with characteristic features including short limbs, a larger head, and a prominent forehead. Intelligence is normal. With monitoring for specific complications and supportive care, children with achondroplasia lead full, active, and independent lives.
Adenoid Hypertrophy and Breathing
Adenoids are lymphoid tissue located behind the nose that help fight infection in young children. When adenoids become enlarged (adenoid hypertrophy), they can block the nasal airway, causing chronic mouth breathing, snoring, nasal speech, and sleep-disordered breathing. Enlarged adenoids are most common between ages 2-7 and are a leading cause of obstructive sleep apnea in young children. Treatment ranges from watchful waiting and nasal steroids to surgical removal (adenoidectomy) if breathing or sleep is significantly affected.