Cellulitis (Skin Infection) in Babies
The short answer
Cellulitis is a bacterial skin infection that causes an area of skin to become red, swollen, warm, and tender. It can happen when bacteria enter through a break in the skin such as a scratch, insect bite, or eczema patch. Cellulitis requires antibiotic treatment and needs medical attention because it can spread. With prompt treatment, most cases clear up completely within 7-10 days.
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By Age
What to expect by age
0-6 months
Cellulitis in very young infants is taken seriously because their immune systems are still developing. It can occur around the umbilical stump, circumcision site, or any area of broken skin. Redness that is spreading, warmth to the touch, or swelling should be evaluated promptly. Young infants with cellulitis may need to be monitored more closely, and some cases may require hospital-based treatment.
6-12 months
As babies become mobile and start exploring, minor scratches and insect bites provide entry points for bacteria. Cellulitis at this age commonly appears on the legs, arms, or face. Watch for a red area that seems to be growing larger over hours. Drawing a line around the red edge with a pen can help you track whether it is spreading.
1-3 years
Toddlers are prone to minor injuries, bug bites, and skin picking that can lead to cellulitis. It frequently occurs on the legs, feet, or around the eyes (periorbital cellulitis). Facial cellulitis, especially around the eye, always needs prompt medical evaluation. Keeping wounds clean, applying antibiotic ointment to cuts, and managing eczema can help prevent cellulitis.
What Should You Do?
When to take action
- A small area of redness directly around a fresh cut or scrape that is not spreading
- Mild redness from an insect bite that stays the same size and improves over a day or two
- A warm, slightly pink area right at the site of a vaccination injection
- A red area of skin that seems to be slowly expanding over 1-2 days
- Your child has a tender, warm, swollen area of skin after an insect bite or scratch
- Redness and swelling persist or worsen despite keeping the area clean
- Your child has recurring skin infections
- Redness is spreading rapidly over hours, especially with red streaking away from the site
- Your child has a fever along with a red, swollen, warm area of skin
- There is swelling, redness, or warmth around your child's eye (periorbital cellulitis requires urgent evaluation)
- The infected area has pus, blistering, or dark discoloration
- Your child appears very unwell, lethargic, or is in significant pain
Sources
Related Resources
Trust your instincts. If something feels wrong, reach out to your pediatrician.
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Related Medical Concerns
My Baby Has Impetigo
Impetigo is a common bacterial skin infection in babies and young children, caused by staph or strep bacteria. It appears as red sores that quickly develop into honey-colored crusts, most often around the nose, mouth, and hands. While it looks unpleasant, impetigo is very treatable with antibiotic ointment or oral antibiotics and clears up within a week or two of starting treatment.
My Baby Has Insect Bites
Insect bites on babies are very common and usually result in small red bumps that may be itchy or slightly swollen. Because babies have sensitive skin and immature immune systems, their reactions to bug bites can look more dramatic than an adult's. Most bites heal on their own within a few days with simple home care.
Baby Eczema (Atopic Dermatitis)
Baby eczema is extremely common, affecting up to 20% of infants, and is not caused by anything you did wrong. It shows up as dry, red, itchy patches and is very manageable with consistent moisturizing and gentle skin care. Most children outgrow it by school age.
Blisters on Baby's Skin - Causes and When to Worry
Blisters on a baby's skin can have many causes ranging from harmless (sucking blisters, friction blisters) to conditions requiring medical attention (burns, infections like hand-foot-and-mouth disease, impetigo, or herpes). A single blister on a newborn's lip or hand from sucking is very common and harmless. Multiple blisters, blisters with fever, blisters that spread rapidly, or blisters in a newborn under 1 month should be evaluated by a doctor.
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.