Most babies lose some or all of their hair during the first six months of life, and it’s completely normal. Hair loss in newborns peaks around 3 months old, then new, often different-textured hair gradually grows in to replace it. The process can look alarming, but it’s a predictable part of infant development.
Why Newborn Hair Falls Out
The hair your baby is born with grew during pregnancy, when hormone levels from the mother kept those follicles in an active growth phase. After birth, those hormone levels drop sharply in the baby’s body. Without that hormonal support, a large number of hair follicles shift into a resting phase at the same time. After a few weeks in that resting phase, the hairs release and fall out. Doctors call this process telogen effluvium, and it happens in adults too, usually after major hormonal shifts like childbirth or surgery.
Because so many follicles reset on the same schedule, the shedding can seem dramatic. Some babies lose hair evenly across their scalp. Others lose it in patches, depending on which follicles entered the resting phase first. The replacement hair that grows in is your baby’s “real” hair, and it may be a completely different color or texture than what they were born with. A baby born with dark, thick hair might grow back fine blonde hair, or vice versa.
The Bald Spot on the Back of the Head
If your baby has a noticeable bald patch specifically on the back of their head, friction is the most likely cause. Babies spend a lot of time on their backs, both during sleep and while lying in car seats, strollers, and bouncers. The constant rubbing between the scalp and the mattress or surface wears away the fine hair in that area. Some babies also turn their head side to side repeatedly, which accelerates the thinning.
This friction-related hair loss is temporary. Once your baby starts sitting up and spending less time on their back, the hair grows back on its own. You don’t need to change your baby’s sleep position. Back sleeping remains the safest position for reducing the risk of sudden infant death syndrome, and the bald spot resolves itself without any intervention.
Cradle Cap and Hair Loss
Cradle cap, formally called infantile seborrheic dermatitis, is another common reason babies lose hair in patches. It shows up as thick, crusty, or scaly patches on the scalp. On lighter skin, the patches tend to look yellow and greasy. On darker skin, the scaling appears as thick crusts with flaky white or yellow scales. Some babies also develop similar patches on their ears, eyelids, nose, or groin.
Cradle cap itself isn’t painful or itchy (which is what distinguishes it from eczema, or atopic dermatitis, which does itch). But the thick buildup of skin and oil on the scalp can trap hair and pull it out when the crusts loosen or flake off. The hair loss is temporary and fills back in once the cradle cap clears. Gently massaging the scalp with a soft brush or washcloth during bath time helps loosen the scales. Many cases resolve within a few weeks to months without treatment.
When Hair Loss Signals Something Else
Normal baby hair loss is diffuse or friction-related, and the scalp underneath looks healthy. A few specific patterns point to something that needs medical attention.
Tinea capitis, a fungal infection of the scalp, causes distinct symptoms that look nothing like normal shedding. Watch for swollen red patches, dry scaly rashes, severe itchiness, and well-defined patches of bald skin. One telltale sign is “black dot” ringworm, where hair shafts break right at the skin surface, leaving tiny dark dots across the bald area. Another pattern, called gray patch ringworm, leaves short, broken hair stubs. Some children develop a painful, swollen lump on the scalp that may ooze pus. Tinea capitis requires prescription medication and won’t resolve on its own.
Alopecia areata, an autoimmune condition, causes smooth, round bald patches with no redness, scaling, or broken hairs. It’s uncommon in babies under 6 months but can appear in older infants and toddlers. The scalp in the bald area looks completely smooth and normal, which helps distinguish it from fungal infections.
As a general rule, if the bald area has redness, swelling, oozing, broken hair stubs, or if your baby seems uncomfortable or itchy, those signs suggest something beyond normal shedding.
What the Regrowth Looks Like
New hair typically starts growing in between 6 and 12 months of age, though the timeline varies. The first regrowth is often fine and wispy, and it may take until your baby’s first birthday or beyond for the hair to thicken noticeably. Some babies go through more than one color or texture change before their hair settles into its long-term pattern, which may not be fully established until age 2 or later.
There’s nothing you need to do to encourage regrowth. Shaving a baby’s head does not make hair grow back thicker. That’s a persistent myth based on the fact that shaved hair has a blunt tip when it regrows, making it feel coarser. The follicle itself isn’t affected. Gentle scalp care during baths and avoiding tight headbands or clips that pull on fine hair is all that’s needed while you wait for the new growth to come in.