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The Daily Insight

What should Fontanelle feel like

Author

Olivia Owen

Published Mar 18, 2026

The fontanelles should feel firm and very slightly curved inward to the touch. A tense or bulging fontanelle occurs when fluid builds up in the brain or the brain swells, causing increased pressure inside the skull. When the infant is crying, lying down, or vomiting, the fontanelles may look like they are bulging.

How would you describe a normal fontanelle?

The four fontanelles Ensure you make note of any retraction or bulging, as the normal fontanelle feels firm and flat (not sunken or bulging). You may also notice visible pulsations in the anterior fontanelle (Wheeler, 2015), which is normal.

When should I be concerned about my baby's soft spot?

Normally, a baby’s soft spot is firm and curves in just slightly. But call your doctor right away if you notice these rare but possible signs of trouble: A dramatically sunken fontanelle. This can signal dehydration, especially if your baby isn’t eating or drinking well and is having fewer wet diapers than usual.

How do you feel a fontanelle?

When you gently run your fingers over the top of your child’s head, the soft spot should feel soft and flat with a slight downward curve. When your child is crying, vomiting, or lying down, the anterior fontanelle may look raised or like it’s bulging.

What does a sunken fontanelle feel like?

You may never be able to feel or see this one. The one on the top of the head remains present until your baby is between 7 and 19 months old. A baby’s soft spots should be relatively firm and curve ever so slightly inward. A soft spot with a noticeable inward curve is known as a sunken fontanel.

What is craniosynostosis?

Craniosynostosis is a birth defect in which the bones in a baby’s skull join together too early. This happens before the baby’s brain is fully formed. As the baby’s brain grows, the skull can become more misshapen.

What are the signs of craniosynostosis?

  • A full or bulging fontanelle (soft spot located on the top of the head)
  • Sleepiness (or less alert than usual)
  • Very noticeable scalp veins.
  • Increased irritability.
  • High-pitched cry.
  • Poor feeding.
  • Projectile vomiting.
  • Increasing head circumference.

At what age does the Fontanel close?

These soft spots are spaces between the bones of the skull where bone formation isn’t complete. This allows the skull to be molded during birth. The smaller spot at the back usually closes by age 2 to 3 months. The larger spot toward the front often closes around age 18 months.

How does a bulging fontanelle feel?

The fontanelles should feel firm and very slightly curved inward to the touch. A tense or bulging fontanelle occurs when fluid builds up in the brain or the brain swells, causing increased pressure inside the skull. When the infant is crying, lying down, or vomiting, the fontanelles may look like they are bulging.

How do you examine anterior fontanelle?

The anterior and posterior fontanelle should be soft to palpation. The anterior fontanelle should be between 1 and 3 cm in size and the posterior fontanelle should admit a fingertip. Following a vaginal delivery, over-riding of the skull bones may temporarily reduce the size of the anterior fontanelle.

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Is baby soft spot supposed to pulsate?

In some instances, the soft spot on the top of your baby’s head may seem to be pulsating. There is no need to worry—this movement is quite normal and simply reflects the visible pulsing of blood that corresponds to your baby’s heartbeat.

Why has my baby's soft spot dipped?

It is normal for a fontanel to form an inward curve in infants while their skull is still hardening. But in some cases, it may become sunken, and the cause may need medical treatment. A sunken fontanel, when accompanied by other symptoms, can be a sign of dehydration or malnutrition.

Is it normal for a baby's soft spot to be swollen?

Parents should watch for soft spots that are curved outward on their baby’s head and feel very firm. This is known as a bulging fontanel and may be a sign of brain swelling or fluid buildup in the brain. A bulging fontanel is an emergency.

How do I know if baby is dehydrated?

  1. Dry tongue and dry lips.
  2. No tears when crying.
  3. Fewer than six wet diapers per day (for infants), and no wet diapers or urination for eight hours (in toddlers).
  4. Sunken soft spot on infant’s head.
  5. Sunken eyes.
  6. Dry and wrinkled skin.
  7. Deep, rapid breathing.

Is soft spot supposed to be indented?

No need to worry if your baby’s fontanelle seems slightly indented. But if your baby has a noticeably sunken soft spot, it’s important that you give him additional fluids as soon as possible. If you’re breastfeeding, nurse more often.

What is a bulging soft spot?

A tense or bulging fontanelle occurs when fluid builds up in the brain or the brain swells, causing increased pressure inside the skull. When the infant is crying, lying down, or vomiting, the fontanelles may look like they are bulging.

What is Carpenter's syndrome?

Carpenter syndrome is a condition characterized by the premature fusion of certain skull bones (craniosynostosis), abnormalities of the fingers and toes, and other developmental problems. Craniosynostosis prevents the skull from growing normally, frequently giving the head a pointed appearance (acrocephaly).

What is coronal synostosis?

Coronal synostosis is one type of craniosynostosis affecting the shape of the front of the head. The term craniosynostosis refers to the premature fusion of the bones of an infant’s head. The skilled surgeons of St. Louis Children’s Hospital treat coronal synostosis and all other types of craniosynostosis in infants.

Is craniosynostosis obvious?

The signs of craniosynostosis are usually noticeable at birth, but they’ll become more apparent during the first few months of your baby’s life. Signs and severity depend on how many sutures are fused and when in brain development the fusion occurs.

What is microcephalic?

Microcephaly is a birth defect where a baby’s head is smaller than expected when compared to babies of the same sex and age. Babies with microcephaly often have smaller brains that might not have developed properly.

What is frontal suture?

The frontal suture is a fibrous joint that divides the two halves of the frontal bone of the skull in infants and children. Typically, it completely fuses between three and nine months of age, with the two halves of the frontal bone being fused together.

What is Metopic synostosis?

The metopic suture is the first suture in an infant’s head to close (fuse) as it grows. When this suture fuses prematurely, it can impact the baby’s appearance and brain development. Babies with metopic synostosis have a noticeable ridge running down their forehead, causing the forehead to form in a triangular shape.

How obvious is a bulging fontanelle?

A bulging fontanel means that the soft spot looks bigger than usual. The normally soft area may swell up taller than the rest of the skull. The baby’s head may appear to change shape, or the soft spot might look misshapen. Sometimes, the baby’s whole head looks bigger.

What happens if you press on the Fontanel?

A baby’s soft spots are called fontanelles. They allow your baby’s brain to grow larger at a fast rate over their first year of life. It’s important to avoid pressing into their soft spots, as it could cause damage to their skull or brain.

When is craniosynostosis detected?

Craniosynostosis is seen in approximately one in 2,000 births. It is not typically detected during pregnancy and if so, usually not until the third trimester.

What is the weakest part of the skull?

Clinical significance The pterion is known as the weakest part of the skull. The anterior division of the middle meningeal artery runs underneath the pterion. Consequently, a traumatic blow to the pterion may rupture the middle meningeal artery causing an epidural haematoma.

Why does my 2 year old still have a soft spot?

Sunken in soft spot This is often a sign of dehydration, she says. It may occur if your child is sick and not getting enough fluids. What you should do: See your pediatrician if the sunken appearance persists and you can’t get your baby to take in more fluids.

Is a full anterior fontanelle normal?

The anterior fontanel is considered to be small if it is less than 0.6cm; normal if it is 0.6–3.6cm and large fontanelle if it is greater than 3.6cm.

What is a normal anterior fontanelle?

The average size of the anterior fontanel is 2.1 cm, and the median time of closure is 13.8 months. The most common causes of a large anterior fontanel or delayed fontanel closure are achondroplasia, hypothyroidism, Down syndrome, increased intracranial pressure, and rickets.

Can you feel baby skull sutures?

It is normal for infants to have these soft spots, which can be seen and felt on the top and back of the head. Fontanelles that are abnormally large may indicate a medical condition. The sutures or anatomical lines where the bony plates of the skull join together can be easily felt in the newborn infant.

Can you see a pulse in a fontanelle?

Sometimes the fontanel can look like it’s pulsating. This is perfectly normal and is just the pulsing of blood that coincides with your baby’s heartbeat.