Cellulitis in Babies: Red Flags & Treatment | Parenting Hub
Cellulitis is a bacterial skin infection that spreads quickly. Hot, red, swollen skin in a baby — especially with fever — needs same-day medical care.
Cellulitis is a deep skin infection that spreads quickly. Hot, red, tender skin — especially around a cut, bite or eczema patch — needs same-day medical assessment in babies.
What cellulitis looks like
A patch of skin that's red, warm, swollen and painful — and that's enlarging hour by hour. There's often a starting point: a scratch, insect bite, eczema crack or vaccine site. Baby may have a fever and be off feeds.
Why it's urgent
Bacteria (usually Staph or Strep) are spreading through the deeper skin and can enter the bloodstream. In a baby — especially under 3 months — this can become serious quickly. Treatment is oral or IV antibiotics, depending on age and how unwell baby is.
Tracking the spread
While waiting for care, draw a pen line around the edge of the redness. If it spreads beyond the line within a few hours, that's a clear sign it's progressing — note this when you see the doctor.
When to seek help
- Any baby under 3 months with hot red skin — go to ED
- Fever over 38°C
- Red streaks running away from the patch
- Baby drowsy, refusing feeds, or unusually unwell
- Cellulitis near the eye — go to ED
Common questions
Can I treat it at home with antiseptic cream?
No — cellulitis needs antibiotics. Antiseptic creams can't reach the bacteria in the deeper layers.
How quickly will antibiotics work?
You should see redness stop spreading within 24–48 hours. If it's still spreading after 48 hours, return for review.