Caput succedaneum is a soft, puffy swelling on a newborn’s scalp caused by pressure during vaginal delivery. It’s present at birth and typically resolves on its own within a few days, without any treatment. While it can look alarming to new parents, it’s a common and generally harmless condition.
What Causes the Swelling
As a baby moves through the birth canal during a vaginal delivery, the head is squeezed by both the uterine and vaginal walls. This sustained pressure pushes fluid into the soft tissue just beneath the skin on the top of the scalp. The result is a visible area of puffiness, sometimes described as a “conehead” shape, that’s noticeable right after birth.
The swelling sits in the superficial layers of the scalp, above the tough connective tissue that covers the skull. Because it’s in this shallow layer, the fluid isn’t trapped by the boundaries of the skull bones. That’s why the swelling can spread across the top of the head rather than staying confined to one spot.
Risk Factors That Make It More Likely
Any vaginal delivery can produce caput succedaneum, but certain circumstances increase the chances significantly:
- Vacuum-assisted delivery is the single biggest risk factor, more so than even forceps-assisted delivery. The suction cup placed on the baby’s head adds direct pressure to the scalp.
- Prolonged or difficult labor, particularly when cervical dilation progresses slowly (less than 1.2 centimeters per hour for first-time mothers).
- First pregnancy, because the birth canal hasn’t been stretched by a previous delivery.
- A larger-than-average baby (over about 8 pounds 13 ounces), which increases the pressure the head experiences.
- Low amniotic fluid, which reduces the cushioning around the baby during labor.
- Premature rupture of membranes (water breaking early), which also reduces that protective fluid buffer.
Caput succedaneum is rare after cesarean deliveries, since the baby doesn’t pass through the birth canal.
What It Looks and Feels Like
The swelling is soft and spongy to the touch. It typically appears on the part of the head that led the way through the birth canal, usually the top or back of the skull. One of its defining features is that it crosses suture lines, the natural seams between a baby’s skull bones. The puffiness can spread broadly across the scalp rather than being confined to one bone.
The skin over the swelling may look bruised or discolored. In some cases, there’s mild skin breakdown where the most pressure was applied, especially after a vacuum-assisted delivery. The swelling is present immediately at birth, which is another key identifying feature.
Caput Succedaneum vs. Cephalohematoma
These two conditions are easy to confuse because both involve swelling on a newborn’s head, but they differ in important ways:
- Timing: Caput succedaneum is visible right at birth. A cephalohematoma typically doesn’t appear until hours or even one to three days later.
- Location: Caput succedaneum crosses suture lines and can spread across the scalp. A cephalohematoma stays confined to a single skull bone because the bleeding is trapped beneath the membrane that covers that bone.
- What’s underneath: Caput succedaneum is fluid buildup in the soft tissue just under the skin. A cephalohematoma is a collection of blood between the skull bone and its outer covering, sitting deeper.
- How long it lasts: Caput succedaneum fades within days. A cephalohematoma can take weeks to fully resolve because the body has to slowly reabsorb clotted blood.
The distinction matters because a cephalohematoma carries a higher risk of complications like jaundice. As the trapped blood breaks down, it releases bilirubin, a yellow pigment that the baby’s immature liver may struggle to process. Large caput succedaneum with significant bruising can also contribute to elevated bilirubin levels, so medical teams monitor for yellowing of the skin in either case.
How It Resolves
Caput succedaneum requires no treatment. The fluid reabsorbs naturally, and the swelling typically disappears within a few days after birth. There’s no need to massage it, apply ice, or drain it. The baby’s head will gradually return to a normal shape on its own.
The condition doesn’t cause brain injury or long-term problems. It doesn’t affect skull development or the fontanelles (the soft spots on a baby’s head). Once the swelling goes down, there’s no lasting mark or change to the scalp. For parents, the main thing to watch for in the days after birth is any yellowing of the baby’s skin or eyes, which could indicate jaundice from the breakdown of bruised tissue. Medical staff in the hospital typically check bilirubin levels as part of routine newborn care.