Most babies lose some or all of their hair during the first six months of life, with shedding peaking around three months old. This is completely normal. It happens because the hormonal environment that supported hair growth in the womb changes dramatically after birth, pushing a large number of hair follicles into their resting and shedding phase all at once.
The Hormonal Shift Behind Baby Hair Loss
While a baby is developing in the womb, high levels of maternal estrogen cross the placenta and stimulate the baby’s hair follicles. This keeps hair in its active growth phase, which is why many newborns arrive with a full head of hair. After delivery, the baby is no longer receiving that estrogen boost. Hormone levels drop back to baseline, and the hair follicles respond by entering the resting phase simultaneously.
About 8 to 12 weeks after birth, those resting hairs shed. This synchronized shedding is called telogen effluvium, and it’s the same process that causes postpartum hair loss in new mothers. In both cases, it’s not damage or disease. It’s simply the body recalibrating after a major hormonal shift. The follicles are healthy and will cycle back into active growth on their own.
The Bald Spot on the Back of the Head
Many parents notice a specific bald patch at the back of their baby’s head rather than all-over thinning. This pattern, called neonatal occipital alopecia, appears around 2 to 3 months of age and is the most common form of infant hair loss. It happens because the back of the head is where babies rest against mattresses, car seats, and swings for hours each day. The combination of hormonal shedding and gentle friction in that area accelerates the hair loss in one spot.
In a retrospective study published in the Annals of Dermatology, the average time for this bald patch to appear was 2.8 months, and it typically filled back in by about 6.5 months. No treatment is needed. Once your baby starts sitting up and spending less time on their back, the friction decreases and the hair grows in normally.
When the New Hair Looks Different
The hair that grows back after this shedding phase often surprises parents. A baby born with dark, straight hair might regrow lighter hair with waves or curls, or vice versa. This is normal. Newborn hair is typically very fine and silky, often lighter in color, because the follicles haven’t yet been fully stimulated by the hormones that drive thicker growth later.
Hair texture continues to evolve throughout childhood. Between ages one and three, slightly thicker strands emerge, sometimes with soft curls or waves that weren’t there before. By ages four to six, a more defined curl pattern or straight thickness develops. The most dramatic shift comes during puberty, when a surge of androgens makes hair coarser, faster-growing, and often darker. The hair your baby is born with is essentially a rough draft. The final version takes years to arrive.
Cradle Cap and Hair Loss
Cradle cap (seborrheic dermatitis) is another common scalp condition in infants that can occasionally contribute to hair thinning. It shows up as rough, greasy, or scaly patches on the scalp. While cradle cap rarely causes significant hair loss on its own, a baby can lose some hair in the areas where the scaling is thickest. That hair grows back once the cradle cap clears. Cradle cap looks different from normal shedding because of the visible flaking and oily patches. Gentle brushing and moisturizing the scalp typically resolve it without any lasting effect on hair growth.
Signs That Something Else Is Going On
In the vast majority of cases, infant hair loss is harmless and temporary. But a few patterns are worth paying attention to because they can signal a less common condition.
Fungal scalp infections (tinea capitis) are rare in infants, but when they occur, they’re often misdiagnosed as cradle cap because the symptoms overlap. The key differences: a fungal infection typically causes redness along with the scaling, and it may produce distinct patches of thinning rather than the diffuse flaking of cradle cap. Because tinea capitis is so uncommon in babies, it’s frequently missed or treated as something else, which can delay appropriate care.
Alopecia areata, an autoimmune condition that causes smooth, well-defined patches of hair loss, is extremely rare in infants. Fewer than 10 cases have been reported in babies under six months old. The patches look distinctly different from normal baby baldness. They’re completely smooth with sharp borders, and a dermatologist may notice characteristic signs like tiny “exclamation point” hairs (short, broken strands that taper at the base) at the edges of the patches.
Hair loss that comes with redness, scaling, crusting, or patches with very defined borders warrants a closer look. So does hair loss that persists well past six months without any sign of regrowth. Normal baby shedding is diffuse or concentrated at the back of the head, resolves on its own, and leaves behind a scalp that looks healthy and smooth.