Baby rashes explained: heat rash, acne, nappy rash & when to worry
Baby skin can look a lot worse than it actually is — but sometimes it does need a second look.
Rashes are really common in the early weeks, and it’s not always obvious what you’re looking at.
This is just a simple way to make sense of the main ones you’ll probably come across.
If you’re figuring things out as you go, this also links with
Body folds: eczema + heat rash
These tend to show up in warm, tucked away areas like the neck, underarms, and behind knees.
Heat rash:
Tiny red or flesh-coloured bumps
Feels warm or slightly sweaty
Linked to overheating
Eczema:
Dry, rough, or slightly raised patches
Can look darker or more irritated
Often comes and goes
Both can look similar at first but usually improve once the skin is cooled and kept dry.
Face & head: baby acne + cradle cap
These are really common early on and can look worse than you expect.
Baby acne
Small whiteheads or red bumps
Common on cheeks, forehead, chin
Can come and go
Cradle cap
Yellow or white flaky patches
Usually on scalp or eyebrows
Not usually itchy
Both usually settle on their own without much treatment.
What helps: Products I actually used
Bepanthen Nappy Cream. Worked really well for nappy rash and helped calm irritation quickly
Water Wipes. Simple, gentle option for senstive skin.
Nappy area: nappy rash + teething rash
These usually show up around the nappy area and can overlap.
Nappy rash
Red or sore skin
Flat irritation at first
Often improves quickly with care
Teething-related rash
Can appear more spotty
Linked to extra saliva and moisture
May flare up suddenly
If it starts spreading, looking worse, or just not improving after a few days, that’s when to pay more attention.
This often overlaps with feeding guide— especially things like feeding and nappy changes.
Final thought
Most baby rashes are really common and settle on their own.
What matters more is how it changes — improving vs spreading.
That’s usually your biggest clue.
This isn’t professional advice — just a simple breakdown of what I’ve found helpful.
Most of this is easier to understand visually.
I’ve put all my guides into one place so you can browse them properly.
FAQs
Are baby rashes common?
Very. A lot of newborns and babies get rashes at some point, especially while their skin is still adjusting to heat, moisture, dribble, nappies, or hormones.
How do I know if a rash is serious?
Most rashes are harmless, but things like a fever, blistering, difficulty breathing, rapidly spreading rash, or baby seeming unusually unwell should be checked urgently. Trust your instincts if something feels off.
Does teething cause rashes?
Teething itself doesn’t usually cause body rashes, but constant dribble can irritate the skin around the mouth, chin, and neck folds. Keeping the area dry can help a lot.
What helps prevent nappy rash?
Frequent nappy changes, letting the area air out when possible, and using a barrier cream usually help. Sometimes certain wipes or nappies can irritate sensitive skin too.
Why does baby acne happen?
Baby acne is really common in the early weeks and is usually linked to hormones. It often looks worse before it improves, but it normally clears on its own over time.