Cellulitis in Babies and Children
Content reviewed against published AAP, NIH, Mayo Clinic guidelines
Last reviewed:
Cellulitis is a common bacterial skin infection affecting the deeper layers of the skin (dermis and subcutaneous tissue). It causes a spreading area of redness, swelling, warmth, and tenderness. In children, it often develops after a break in the skin such as a cut, insect bite, or area of eczema, and is most commonly caused by Staphylococcus aureus or Group A Streptococcus.
Key takeaways
- Cellulitis is a common bacterial skin infection affecting the deeper layers of the skin (dermis and subcutaneous tissue).
- Duration: With appropriate antibiotic treatment, improvement should be seen within 48-72 hours. Complete resolution typically takes 7-10 days. If not improving within 48 hours, reassessment is needed.
- Go to ER if: Cellulitis in a baby under 3 months old
- No vaccine currently available
Symptoms
How It Presents by Age
0-3 months
Can develop rapidly and progress quickly to serious infection. Often occurs around the umbilical stump or circumcision site. Neonates may not mount fever well, so look for poor feeding, irritability, or lethargy.
Risk level: High — requires urgent evaluation and often IV antibiotics
3-12 months
Most commonly occurs on the face (periorbital cellulitis) or extremities. May follow insect bites or minor skin trauma. Spreading redness with swelling and warmth.
Risk level: Moderate to high
1-3 years
Frequently develops around insect bites, scrapes, or eczema patches. Buccal (cheek) cellulitis was historically associated with H. influenzae type b (now rare due to vaccination). Periorbital cellulitis remains common.
Risk level: Moderate
3-5 years
Usually affects extremities or face. Develops after cuts, abrasions, or bug bites. Child may be febrile and complain of pain. Red borders can be marked with pen to track progression.
Risk level: Moderate
Treatment
Oral antibiotics
First-line for uncomplicated cellulitis: cephalexin or clindamycin. MRSA coverage (trimethoprim-sulfamethoxazole or clindamycin) added if risk factors present. Course is typically 7-10 days.
IV antibiotics
Required for infants under 3 months, rapidly progressing cellulitis, facial cellulitis, periorbital or orbital cellulitis, or when oral antibiotics are failing.
Incision and drainage
If an abscess is present, it must be drained. Cellulitis alone does not require drainage.
Elevation and marking
Elevate the affected limb to reduce swelling. Mark the borders of redness with a pen to track whether the infection is spreading or improving on treatment.
Wound care
Keep any entry wound clean. Warm compresses may help reduce discomfort.
Home Care
- Elevate the affected area above heart level when possible
- Draw a line around the edge of redness with a marker to track spread
- Apply warm compresses for comfort (not hot)
- Give acetaminophen or ibuprofen for pain and fever
- Complete the full course of prescribed antibiotics
- Keep the area clean and cover any open wounds
- Monitor closely for spreading beyond the marked border
When to Worry
Go to the ER if:
- Cellulitis in a baby under 3 months old
- Orbital cellulitis — swelling, pain with eye movement, or decreased vision
- Rapidly spreading redness with high fever and ill appearance
- Red streaks spreading up a limb
- Signs of sepsis — lethargy, mottled skin, rapid breathing, poor perfusion
- Child unable to open eye due to swelling
- Fluctuant area suggesting abscess that needs drainage
Call your doctor if:
- Suspected cellulitis — red, warm, swollen area of skin
- Infection is not improving after 48 hours of oral antibiotics
- Redness is spreading despite treatment
- New fever develops during treatment
- Cellulitis around the eye (periorbital)
- Child is under 6 months old
Keep an eye on:
- Redness is spreading beyond the marked border despite antibiotics
- Child develops high fever (over 101.3F/38.5C)
- Red streaks spreading from the area toward the trunk
- Area becomes increasingly painful or develops fluctuance (boggy feel)
- Cellulitis is on or around the eye
- Child appears increasingly unwell
Prevention
- Clean all cuts, scrapes, and insect bites promptly with soap and water
- Apply antibiotic ointment to minor wounds
- Keep skin moisturized to prevent cracking (especially with eczema)
- Treat impetigo and other skin infections promptly
- Trim fingernails to reduce skin damage from scratching
- Use insect repellent to prevent bites
- Keep eczema well controlled with daily moisturizing
Contagion & Incubation
Incubation
Typically develops within 1-3 days after bacteria enter a skin wound
Contagious for
Cellulitis itself is not contagious. However, the underlying bacteria (such as MRSA) can spread through direct contact with drainage from the wound.
Duration
With appropriate antibiotic treatment, improvement should be seen within 48-72 hours. Complete resolution typically takes 7-10 days. If not improving within 48 hours, reassessment is needed.
Frequently asked questions
How long does cellulitis last?
How does cellulitis spread?
When should I take my baby to the ER?
Can cellulitis 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
Cellulitis is treatable with appropriate medical care. Seek emergency care if cellulitis in a baby under 3 months old.
Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.