Baby Has a Lump on Their Head After Birth
Medically reviewed by Dr. Michael Okonkwo, MD, FAAP · Board-Certified Neonatologist
Content reviewed against published AAP, NIH, AAP guidelines
Last reviewed:
If your baby has been diagnosed with or you suspect baby has a lump on their head after birth, here is what the evidence says.
The short answer
Lumps on a newborn's head after birth are common and usually benign. The two most common types are caput succedaneum (soft swelling of the scalp that crosses suture lines and resolves within days) and cephalohematoma (a firmer collection of blood under the skull's membrane that stays within one bone and resolves over weeks to months). Both result from the normal pressure of delivery and almost always resolve on their own without treatment.
Key takeaways
- Lumps on a newborn's head after birth are common and usually benign. The two most common types are caput succedaneum (soft swelling of the scalp that crosses suture lines and resolves within days) and cephalohematoma (a firmer collection of blood under the skull's membrane that stays within one bone and resolves over weeks to months). Both result from the normal pressure of delivery and almost always resolve on their own without treatment.
- Usually normal when: A soft, squishy swelling present at birth that resolves within 2-3 days (caput succedaneum)
- Call your doctor if: The swelling is rapidly increasing, feels warm, or the skin over it is red - this could indicate infection
- Varies by age — see the age-by-age breakdown below
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What Parents Should Know
According to AAP, NIH guidelines, lumps on a newborn's head after birth are common and usually benign. The two most common types are caput succedaneum (soft swelling of the scalp that crosses suture lines and resolves within days) and cephalohematoma (a firmer collection of blood under the skull's membrane that stays within one bone and resolves over weeks to months). Both result from the normal pressure of delivery and almost always resolve on their own without treatment. At 0-48 hours, immediately after birth, your baby's head may look slightly misshapen, elongated, or have visible swelling. This is especially common after vaginal deliveries with prolonged pushing, vacuum assistance, or forceps use. Caput succedaneum is soft, puffy swelling that can feel squishy and may extend across the midline of the skull. It is caused by pressure during delivery and typically resolves within 24-48 hours. A cephalohematoma is a firmer, well-defined bump that usually appears within the first few hours after birth and is limited to one side of one skull bone. It is generally considered normal when a soft, squishy swelling present at birth that resolves within 2-3 days (caput succedaneum). However, you should contact your pediatrician promptly if the swelling is rapidly increasing, feels warm, or the skin over it is red - this could indicate infection.
Normal vs. Concerning
When to Seek Immediate Care
- The swelling is rapidly increasing, feels warm, or the skin over it is red - this could indicate infection
- Your baby is lethargic, not feeding, has a bulging fontanelle, or is showing signs of illness alongside the head swelling
- A new lump appears on your baby's head that was not present at birth and is not associated with a known injury
By Age
What to expect by age
0-48 hours
Immediately after birth, your baby's head may look slightly misshapen, elongated, or have visible swelling. This is especially common after vaginal deliveries with prolonged pushing, vacuum assistance, or forceps use. Caput succedaneum is soft, puffy swelling that can feel squishy and may extend across the midline of the skull. It is caused by pressure during delivery and typically resolves within 24-48 hours. A cephalohematoma is a firmer, well-defined bump that usually appears within the first few hours after birth and is limited to one side of one skull bone.
2-14 days
Caput succedaneum should be nearly or completely resolved by this point. A cephalohematoma, however, may actually become more prominent and feel firmer as the blood collection organizes. This can be alarming for parents but is a normal progression. The body is walling off the blood and will gradually reabsorb it. Do not massage, press on, or try to drain the bump. Some cephalohematomas may cause a slight increase in jaundice risk as the body breaks down the pooled blood.
2-12 weeks
During this period, a cephalohematoma may start to calcify at its edges, making it feel like a hard ring with a soft center. This "crater" feeling is normal and does not indicate a skull fracture. The bump will gradually become smaller as the body reabsorbs the blood. Most cephalohematomas resolve completely within 1-3 months, though some take up to 6 months. The calcified edges will smooth out and remodel as the skull grows.
3-6 months
By 3-6 months, most birth-related head lumps have resolved or are nearly gone. If a bump persists, is growing rather than shrinking, or is accompanied by other symptoms like developmental concerns, mention it to your pediatrician. In rare cases, persistent or unusual lumps may need imaging to rule out other causes. Rest assured that cephalohematomas, even large ones, almost never cause brain injury - the blood is between the skull bone and its outer membrane, not inside the skull.
What to Tell Your Pediatrician
- Describe when you first noticed baby has a lump on their head after birth and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if a cephalohematoma is large (bigger than a golf ball) as it may increase jaundice risk.
- Mention if the bump has not started shrinking after 2-3 months.
- Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
- Bring a list of any questions or observations you want to discuss at the appointment.
What Should You Do?
When to take action
- A soft, squishy swelling present at birth that resolves within 2-3 days (caput succedaneum)
- A firmer bump on one side of the head that appeared within hours of birth and is gradually shrinking (cephalohematoma)
- The bump feels like a hard ring with a soft center as it begins to calcify - this is normal healing
- Your baby is feeding well, alert, and meeting milestones normally despite the bump
- A cephalohematoma is large (bigger than a golf ball) as it may increase jaundice risk
- The bump has not started shrinking after 2-3 months
- You notice the bump is growing rather than shrinking after the first two weeks
- The swelling is rapidly increasing, feels warm, or the skin over it is red - this could indicate infection
- Your baby is lethargic, not feeding, has a bulging fontanelle, or is showing signs of illness alongside the head swelling
- A new lump appears on your baby's head that was not present at birth and is not associated with a known injury
What You Can Do at Home
- Keep track of when you notice baby has a lump on their head after birth — noting the time of day, duration, and any triggers can help your pediatrician.
- Remember that a soft, squishy swelling present at birth that resolves within 2-3 days (caput succedaneum) — this is generally within the range of normal.
- At 0-48 hours, focus on observation rather than intervention unless your pediatrician advises otherwise.
- Follow any care instructions from your pediatrician. Keep a written log of symptoms to bring to appointments.
- While monitoring at home, seek immediate care if the swelling is rapidly increasing, feels warm, or the skin over it is red - this could indicate infection.
Related Conditions
Soft Spot (Fontanelle) Concerns
Your baby's soft spots (fontanelles) are normal openings where the skull bones have not yet fused, allowing for brain growth. It is completely normal for the soft spot to pulse gently or feel slightly firm or soft depending on your baby's position, and it typically closes between 12 and 18 months.
Newborn Jaundice (Yellow Skin)
Newborn jaundice is extremely common, affecting about 60% of full-term and 80% of premature babies. In most cases it is mild and resolves on its own within 1-2 weeks. However, very high bilirubin levels can be dangerous, so it is important to have your baby checked if the yellowing deepens or spreads.
My Baby's Head Shape Looks Abnormal
Many babies develop temporary head shape irregularities that are completely normal. A cone-shaped head from vaginal delivery reshapes within days. Mild positional flattening (plagiocephaly) from sleeping on the back is very common and usually improves with repositioning and tummy time. However, head shape changes involving ridges, a persistently bulging fontanelle, or rapid head growth changes should be evaluated to rule out craniosynostosis.
Related Resources
Frequently asked questions
Is baby has a lump on their head after birth normal?
When should I call the doctor about baby has a lump on their head after birth?
When is baby has a lump on their head after birth normal?
What causes baby has a lump on their head after birth?
What should I mention to my pediatrician about baby has a lump on their head after birth?
Is baby has a lump on their head after birth normal at 0-48 hours?
Is baby has a lump on their head after birth normal at 2-14 days?
Should I go to the ER for baby has a lump on their head after birth?
Does baby has a lump on their head after birth go away on its own?
References
Doctor Visit Checklist
Bring this checklist to your next pediatrician visit to discuss Baby Has a Lump on Their Head After Birth.
Things to mention
- Describe when you first noticed baby has a lump on their head after birth and how it has changed over time.
- Note your baby's current age and which age-specific patterns you are seeing.
- Mention if a cephalohematoma is large (bigger than a golf ball) as it may increase jaundice risk.
- Mention if the bump has not started shrinking after 2-3 months.
- Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
- Bring a list of any questions or observations you want to discuss at the appointment.
Observations to share
- A cephalohematoma is large (bigger than a golf ball) as it may increase jaundice risk
- The bump has not started shrinking after 2-3 months
- You notice the bump is growing rather than shrinking after the first two weeks
Urgent signs to report immediately
- The swelling is rapidly increasing, feels warm, or the skin over it is red - this could indicate infection
- Your baby is lethargic, not feeding, has a bulging fontanelle, or is showing signs of illness alongside the head swelling
- A new lump appears on your baby's head that was not present at birth and is not associated with a known injury
My notes
From ismybabyalright.com — free, evidence-based baby health guides
All content follows our editorial policy and is reviewed against published clinical guidelines.
2,705 evidence-based guides6 authoritative medical sources5 medical advisory board members
Related Resources
Bottom line
Most cases of baby has a lump on their head after birth are normal. Talk to your pediatrician if the swelling is rapidly increasing, feels warm, or the skin over it is red - this could indicate infection.
Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.
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Related Medical Concerns
Soft Spot (Fontanelle) Concerns
Your baby's soft spots (fontanelles) are normal openings where the skull bones have not yet fused, allowing for brain growth. It is completely normal for the soft spot to pulse gently or feel slightly firm or soft depending on your baby's position, and it typically closes between 12 and 18 months.
Newborn Jaundice (Yellow Skin)
Newborn jaundice is extremely common, affecting about 60% of full-term and 80% of premature babies. In most cases it is mild and resolves on its own within 1-2 weeks. However, very high bilirubin levels can be dangerous, so it is important to have your baby checked if the yellowing deepens or spreads.
My Baby's Head Shape Looks Abnormal
Many babies develop temporary head shape irregularities that are completely normal. A cone-shaped head from vaginal delivery reshapes within days. Mild positional flattening (plagiocephaly) from sleeping on the back is very common and usually improves with repositioning and tummy time. However, head shape changes involving ridges, a persistently bulging fontanelle, or rapid head growth changes should be evaluated to rule out craniosynostosis.
Achondroplasia (Dwarfism) in Babies
Achondroplasia is the most common form of short-limbed dwarfism, affecting about 1 in 15,000 to 40,000 births. It is caused by a mutation in the FGFR3 gene and is usually apparent at birth with characteristic features including short limbs, a larger head, and a prominent forehead. Intelligence is normal. With monitoring for specific complications and supportive care, children with achondroplasia lead full, active, and independent lives.
Adenoid Hypertrophy and Breathing
Adenoids are lymphoid tissue located behind the nose that help fight infection in young children. When adenoids become enlarged (adenoid hypertrophy), they can block the nasal airway, causing chronic mouth breathing, snoring, nasal speech, and sleep-disordered breathing. Enlarged adenoids are most common between ages 2-7 and are a leading cause of obstructive sleep apnea in young children. Treatment ranges from watchful waiting and nasal steroids to surgical removal (adenoidectomy) if breathing or sleep is significantly affected.
Adrenoleukodystrophy (ALD) in Babies
X-linked adrenoleukodystrophy (X-ALD) is a genetic disorder affecting about 1 in 17,000 newborns, caused by mutations in the ABCD1 gene on the X chromosome. It primarily affects boys and impairs the breakdown of very long-chain fatty acids (VLCFAs), which accumulate and damage the myelin sheath in the brain and the adrenal glands. The most severe form, cerebral ALD, typically affects boys between ages 4-10 with rapid neurological decline. Newborn screening now enables early detection, and hematopoietic stem cell transplant or gene therapy performed before significant brain involvement can be life-saving.