Infected Insect Bites in Babies: Signs to Watch | Parenting Hub
Most bites itch then settle. But hot, spreading, weeping bites mean infection — and babies need GP review.
An ordinary mosquito bite that gets hot, red and spreading after a day or two has become infected. In babies, that's a same-day GP visit — bites are a common starting point for cellulitis.
Normal vs infected
Normal bite: pink/red bump, peaks at 24 hours, itches, fades over 3–7 days. Infected bite: redness keeps expanding past 48 hours, skin feels hot, becomes painful, may weep yellow fluid, baby may have a fever.
Why babies are higher risk
Babies scratch open bites with sharp nails, and their skin barrier is thinner — making it easy for staph or strep bacteria to take hold. What looks small can become cellulitis within a day.
Care while waiting for GP
- Don't squeeze or pop.
- Clean gently with warm water (no peroxide or alcohol).
- Cover loosely with a non-stick dressing to stop scratching.
- Draw around the redness with pen so you and the GP can see if it's spreading.
- Trim nails and consider scratch mittens.
When to seek help
- Red streaks spreading from the bite
- Hot, hard or rapidly enlarging area
- Fever, lethargy or refusing feeds
- Any baby under 3 months with a hot, red bite
Common questions
Will antiseptic cream fix it?
Mild infection on the surface may, but if redness is spreading, oral antibiotics are needed. Don't delay a GP visit.
How do I prevent infection?
Short nails, cover bites with a light dressing, treat itch early with cool compress so baby scratches less.