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By the Peanutbean parent · checked against CDC, NHS and AAP guidance · how we fact-check

Cradle cap: what it is, what helps, and when to see a doctor

Last verified: July 17, 2026

The short answer: cradle cap is a harmless, extremely common skin condition that shows up as greasy yellow or white scales on your baby’s scalp, usually starting between 3 weeks and 2 months old. It is not caused by anything you did, it does not itch or hurt your baby, and it almost always clears up on its own within a few months, often faster with a simple oil-and-brush routine.

What it looks like

Cradle cap shows up as patches of greasy, scaly skin, most often on the scalp and face, and sometimes in the neck folds, armpits, or nappy area. The scales can look white or yellow and may clump into a crust that flakes off. The skin around the scales can look pink or red on lighter skin, or lighter or darker than the surrounding skin on brown or black skin (NHS: Cradle cap).

It is genuinely common. Around 7 in 10 three-month-olds have some degree of cradle cap, which technically is a form of seborrhoeic dermatitis on the scalp. When the same rash shows up off the scalp, doctors just call it seborrhoeic dermatitis instead (AAP: What is Cradle Cap?).

The important detail for a tired parent at 3am: it is not itchy or painful, and it does not bother your baby, even if it looks alarming to you (NHS).

Why it happens

Nobody knows the exact cause. The two leading theories are a reaction to a common yeast that lives on everyone’s skin, or leftover hormones from pregnancy that make your baby’s oil glands overproduce for a while (AAP). Both sources are clear about what it is not: not an allergy, not an infection, and not a sign of poor hygiene. It also cannot be caught from another baby (NHS; AAP).

What actually helps

You do not have to treat cradle cap at all, since it clears on its own eventually. But if you want to speed things up, both the NHS and AAP recommend roughly the same gentle routine:

• Massage in an oil to loosen scales. A light massage with an emollient (moisturiser) or coconut oil onto the scalp helps soften the scales before washing.
• Wash more often with a mild shampoo. Washing your baby’s hair every other day, using a fragrance-free baby shampoo, helps most babies. Check with your pediatrician before trying a medicated shampoo, since it can irritate delicate skin.
• Brush gently. A soft baby brush or comb during shampooing lifts the loosened scales away.
• For stubborn scales, let oil sit overnight. A little mineral oil, coconut oil, or petroleum jelly left on overnight softens tough crusts before your morning wash and brush.
• If scales spread beyond the scalp, bathe with water and an emollient instead of soap, and if the nappy area is affected, change nappies promptly and use a barrier cream to protect the skin (NHS; AAP).

Both organisations agree on what to avoid, too: skip olive oil, since it may not suit a baby’s skin, and skip peanut oil altogether because of the allergy risk. Avoid adult shampoos, soap, and anything fragranced on the affected area. And do not pick or scratch at the crusts, tempting as it can be, because that raises the risk of infection (NHS; AAP).

It is also completely normal for a bit of hair to come away with the scales when you brush. It grows back (NHS; AAP).

Once the scales clear, keep washing your baby’s hair regularly with a mild shampoo. That habit alone helps keep cradle cap from coming back (AAP).

How long it lasts

Cradle cap usually clears within a few weeks to a few months. Most babies have grown out of it by their first birthday, though a few toddlers keep a little flaky buildup on the scalp a while longer (AAP). If your baby’s skin is prone to dryness and irritation more generally, our guide to baby eczema covers the bigger picture of sensitive newborn skin.

When to see a doctor

Cradle cap on its own rarely needs a doctor’s visit. But see your health visitor, GP, or pediatrician if:

• it has not improved after a few weeks of the routine above
• it covers your baby’s whole body, not just the usual spots
• the crusts bleed, ooze, or leak fluid
• the affected skin looks swollen
• there is an odour coming from the rash
• your baby seems to be in pain or discomfort, which is unusual for ordinary cradle cap

These signs can point to an infection, or sometimes to a different condition entirely, like atopic eczema or scabies, that needs a different treatment (NHS; AAP). A pharmacist can also help in the meantime with advice on emollients, unperfumed shampoos, and barrier creams if the nappy area is involved. And as with anything about your baby’s skin, your own concern is reason enough to ask.

Keep reading

• Baby eczema: what it looks like and what helps
• Nappy rash: what helps, and when to call
• Baby teething: symptoms, timeline, and what helps
• All the first-year windows

Sources

• NHS: Cradle cap (page last reviewed October 2025)
• AAP: What is Cradle Cap? (last updated October 2023)

Peanutbean provides general information for educational purposes only. It is not medical advice. Every baby develops at their own pace. Always talk to your pediatrician about your child’s health.