Baby acne happens because hormones from the placenta stimulate your newborn’s oil glands, causing clogged pores and small breakouts on the face. About 20% of babies develop it before they’re six weeks old, and it almost always clears up on its own without any treatment.
How Placental Hormones Trigger Breakouts
During pregnancy and birth, hormones from the placenta cross into your baby’s bloodstream. These hormones affect the tiny sebaceous glands in your baby’s skin, pushing them to produce more sebum than normal. Sebum is the oily substance that naturally coats and protects skin and hair. In a newborn, that excess oil can clog pores that are still immature and very small, leading to the red bumps and whiteheads you see on your baby’s cheeks, nose, and forehead.
This hormonal surge is temporary. Once your baby’s body clears those residual placental hormones over the first few weeks of life, sebum production slows down and the acne fades.
The Role of Yeast on Newborn Skin
Hormones aren’t the only factor. A type of yeast that naturally lives on human skin also plays a role. In a prospective study of 56 newborns, researchers found that by three weeks of age, 52% of the babies had skin colonized by this yeast. The yeast was found directly inside pustules, and colonization was higher in babies with more severe breakouts. So while hormones set the stage by ramping up oil production, yeast living in that oily environment can trigger additional inflammation and bumps.
When It Appears and How Long It Lasts
Baby acne typically shows up between two and four weeks after birth. It appears as small red or white bumps, mostly concentrated on the cheeks, nose, and forehead, though it can spread to other parts of the face. In most cases, it resolves on its own within a few weeks to a couple of months without leaving any marks.
If acne-like bumps develop later, after about six weeks of age, that’s considered a separate condition called infantile acne. Infantile acne can be more persistent and sometimes involves deeper, more inflamed lesions. It’s worth mentioning to your pediatrician if your baby’s breakouts start or worsen after that six-week mark.
Baby Acne vs. Milia vs. Heat Rash
Not every bump on a newborn’s face is acne, and it helps to know the differences.
- Baby acne looks like small red pimples or whiteheads, often with a slightly inflamed base. It clusters on the forehead, nose, and cheeks.
- Milia are tiny white or yellowish papules caused by trapped keratin (a skin protein) near the surface. They feel firm, aren’t red or inflamed, and disappear on their own within a few weeks. They’re very common and completely harmless.
- Heat rash (miliaria) results from immature sweat glands rather than oil glands. The most common type in newborns appears as tiny, clear, non-inflammatory blisters, usually in skin folds like the neck, armpits, or areas covered by clothing. A more inflamed version produces small red bumps with surrounding redness, but the location is the key difference: heat rash favors warm, covered areas, while baby acne favors the open face.
Both milia and heat rash stem from skin structures that haven’t fully matured yet, but they involve different glands and different parts of the body than acne does.
How to Care for Your Baby’s Skin
The most important thing is to keep it simple. Wash your baby’s face daily with warm water. Every other day, you can use a mild, moisturizing facial soap, alternating with plain water on the off days. Pat the skin dry gently rather than rubbing.
Resist the urge to pick at, pinch, or scrub the bumps. That can irritate the skin further or introduce infection. Avoid applying lotions, ointments, or oils to the affected area, as these products can trap more oil in already-clogged pores and make the acne worse. No special creams or acne treatments designed for older children or adults should be used on newborn skin.
Signs That Need a Closer Look
Typical baby acne is a cosmetic issue, not a medical one. But a few situations are worth bringing up with your pediatrician: breakouts that appear before two weeks of age or persist well past the two-to-three-month mark, bumps that look unusually deep or cyst-like, skin that seems painful or blistered rather than simply bumpy, or acne accompanied by other symptoms like fever or poor feeding. These patterns can occasionally point to a different skin condition or, rarely, an underlying hormonal issue that benefits from evaluation.