Gingivostomatitis in Babies & Toddlers
Content reviewed against published AAP, NIH, AAP guidelines
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Gingivostomatitis is a common infection of the mouth and gums caused by herpes simplex virus type 1 (HSV-1). It typically occurs as the first (primary) HSV-1 infection in young children aged 6 months to 5 years. The condition causes painful ulcers on the gums, tongue, lips, and inside of the cheeks, along with swollen, bleeding gums and fever. It is extremely painful and often leads to dehydration from refusal to eat or drink.
Key takeaways
- Gingivostomatitis is a common infection of the mouth and gums caused by herpes simplex virus type 1 (HSV-1).
- Duration: Fever lasts 5-7 days. Oral ulcers heal in 10-14 days. Peak of symptoms is typically days 3-5. With acyclovir started early, duration may be reduced by 3-4 days.
- Go to ER if: Signs of dehydration (dry mouth, no tears, no urine for 8+ hours)
- No vaccine currently available
Symptoms
How It Presents by Age
0-6 months
Rare due to maternal antibody protection. If it occurs, can be severe. Presents with feeding refusal, excessive drooling, irritability, and fever. Neonatal herpes is a separate, more serious condition.
Risk level: High if present — needs urgent evaluation
6 months-2 years
Peak age for primary HSV-1 gingivostomatitis. Severe mouth pain causes drooling and complete food/liquid refusal. High fever for 5-7 days. Dehydration risk is significant.
Risk level: Moderate to high — dehydration risk
2-5 years
Common age group. Can describe mouth pain. Visible ulcers on gums, tongue, and inside cheeks. May be misdiagnosed as hand-foot-and-mouth disease initially.
Risk level: Moderate
5+ years
Less common for primary infection. When it occurs, similar presentation with painful oral ulcers, fever, and gum inflammation.
Risk level: Low to moderate
Treatment
Acyclovir (antiviral)
Oral acyclovir started within 72-96 hours of symptom onset can reduce duration by 3-4 days. Dose: 15 mg/kg 5 times daily for 7 days. Most effective when started early.
Pain management
Acetaminophen or ibuprofen (6+ months) alternating for pain control. Topical oral analgesics (benzocaine-free products for under 2). "Magic mouthwash" mixtures for older children.
Hydration
Priority is preventing dehydration. Offer cold fluids, ice pops, and cold soft foods. IV fluids if oral intake is inadequate (hospitalization may be needed).
Supportive care
Fever management, rest, and maintaining caloric intake with soft, non-acidic foods. Avoid citrus, salty, or spicy foods that irritate ulcers.
Home Care
- Offer cold fluids, ice chips, and popsicles frequently
- Give pain medication 30 minutes before attempting to feed
- Use a syringe to give small amounts of fluid if child refuses cups
- Serve cold, bland, soft foods (yogurt, pudding, smoothies)
- Avoid acidic foods and drinks (orange juice, tomatoes)
- Keep lips moisturized with petroleum jelly
- Monitor wet diapers to assess hydration (at least 3-4 in 24 hours)
- Use cool-mist humidifier to keep mouth from drying
When to Worry
Go to the ER if:
- Signs of dehydration (dry mouth, no tears, no urine for 8+ hours)
- Unable to swallow any fluids
- Extreme lethargy or unresponsiveness
- Lesions near or in the eyes (ocular herpes — sight-threatening)
- Newborn (under 4 weeks) with any oral vesicles or fever
- Difficulty breathing
Call your doctor if:
- Suspected gingivostomatitis (painful mouth sores with fever)
- Child refusing all liquids for more than a few hours
- Fever lasting more than 5 days
- Fewer wet diapers than normal
- Drooling blood-tinged saliva
- Lesions spreading beyond the mouth
Keep an eye on:
- Not urinating for 8+ hours (sign of dehydration)
- No tears when crying
- Unable to drink any liquids for over 12 hours
- Fever lasting longer than 7 days
- Lesions spreading to the eyes
- Extreme lethargy or listlessness
Prevention
- Avoid kissing children on or near the mouth if you have a cold sore
- Do not share utensils, cups, or towels with an infected person
- Frequent handwashing, especially after touching mouth
- Keep children with active lesions away from newborns and immunocompromised individuals
- Teach children not to share food, drinks, or lip products
- Adults with cold sores should avoid close facial contact with infants
Contagion & Incubation
Incubation
2-12 days after exposure to HSV-1 (average 4 days)
Contagious for
Most contagious during active lesions. Viral shedding can occur for 7-12 days after onset. The virus can also shed asymptomatically from saliva even after lesions heal.
Duration
Fever lasts 5-7 days. Oral ulcers heal in 10-14 days. Peak of symptoms is typically days 3-5. With acyclovir started early, duration may be reduced by 3-4 days.
Frequently asked questions
How long does gingivostomatitis last?
How does herpetic gingivostomatitis spread?
When should I take my baby to the ER?
Can herpetic gingivostomatitis be prevented?
When can my child return to daycare?
Sources
All content follows our editorial policy and is reviewed against published clinical guidelines.
2,705 evidence-based guides6 authoritative medical sources
Related Illnesses
Bottom line
Gingivostomatitis is a viral illness that typically resolves on its own. Seek emergency care if signs of dehydration (dry mouth, no tears, no urine for 8+ hours).
Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.