Heat rash on a newborn’s body: what parents should know

Newborns can become warm under extra layers, hats, blankets, nappies, or close skin contact. Heat rash may look like fine red or skin-coloured bumps around the neck, chest, back, nappy area, or skin folds. Babies cannot describe itch or stinging, so watch for unsettled behaviour and rubbing. Many newborn rashes look alike, and a rash is not confirmed as heat rash from appearance alone. General information about [Heat Rash](/conditions/heat-rash/) and [Skin Redness](/symptoms/skin-redness/) can provide context, but a baby’s age lowers the threshold for contacting a healthcare professional.

Keep the room comfortably cool, remove an unnecessary layer, and use loose breathable clothing. Change damp clothing or nappies and gently pat folds dry after bathing; do not rub. Avoid powders, perfume, essential oils, and thick creams unless a clinician recommends them. Do not apply steroid cream or other medicated products to a newborn without specific advice. A brief cool, damp cloth may soothe intact skin, but never use ice. If a clinician advises moisturising for dryness, ask about a suitable fragrance-free [Emollient Therapy](/treatments/medical-dermatology/emollient-therapy/).

Contact your baby’s healthcare professional promptly for a new rash with fever, poor feeding, unusual sleepiness, breathing difficulty, blisters, purple or bruise-like spots, pus, significant swelling, or rapidly spreading redness. Seek urgent help if your baby seems seriously unwell or has trouble breathing. Also ask for advice if the rash is not settling after gentle cooling, because infections and other newborn conditions can resemble [Skin Rash](/symptoms/skin-rash/). Do not wait for home care to work when your baby’s behaviour or feeding changes.

Ask whether the distribution and texture fit heat rash, how many layers are appropriate for the room, and which cleansers or moisturisers are acceptable. Mention the baby’s temperature, feeding, wet nappies, and any new product or medicine.