What Is A Baby's Soft Spot And How To Take Care Of It?

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A baby’s soft spot is a vulnerable area that is soft to touch. These soft spots are present from birth and remain for months after birth. They are seen in the areas where the cranial bones do not fuse, and they facilitate the movement of the baby’s head from the birth canal during delivery.

Read this post to learn more about soft spots in babies, their function, the number of soft spots babies have, when they close, when to consult a doctor about it, and some tips on taking care of them.

What Is A Baby’s Soft Spot?

A baby’s soft spot is the space between the skull bones that do not fuse and are instead covered by a tough membrane (1). The medical term for the soft spot is fontanelle or fontanel. It is essential to understand the structure of a baby’s skull to understand the purpose of fontanelle.

Structure of a baby’s skull:

The skull may seem like a single bone, but it comprises several bones fused by a fibrous band of tissue called cranial sutures. In babies, the skull is made of six bones: one frontal bone (forehead bone), one occipital bone (bottom rear bone of the skull), two parietal bones (top skull bone), and two temporal bones (bone next to the ears) (2).

These bones are not fused in babies as they are in adults. The infant’s skull bones have considerable gaps referred to as fontanelles, which are filled by a soft yet tough connective membrane. Since they are softer than the rest of the skull, fontanelles are also called soft spots.

What Is The Function Of A Baby’s Soft Spot?

The soft spot serves two primary functions (3):

  1. Allows skull compression during childbirth: Fontanelles make it easier for the baby to pass through the birth canal by allowing the skull bones to compress.
  1. Permits rapid growth of the brain: The baby’s brain can experience rapid growth, which would not be possible if the skull bones are fused together. Soft spots help keep the skull flexible thus allowing it to expand easily every time the baby’s brain grows a little.

How Many Soft Spots Do Babies Have?

An infant has two soft spots (4):

  1. Anterior fontanelle is present on top of the baby’s head, and one that most parents are quite likely to know and feel. Anterior fontanelle marks the point of intersection of the frontal and parietal bones.
  1. Posterior fontanelle is present at the back of the head. It can be less conspicuous than the anterior fontanelle. It marks the meeting point of the parietal and occipital bone.

When Do Soft Spots Close?

The anterior fontanelle can close any time between nine and 18 months. The posterior fontanelle closes by the time the baby is two months old (2). The early closure of the posterior fontanelle often makes it inconspicuous to parents when compared to the prominent anterior fontanelle.

When To Worry About The Baby’s Soft Spot?

Fontanelle-related complications can have a lasting impact on the baby’s growth. The following are common problems to affect a baby’s soft spot:

  1. A Sunken fontanelle is when either of the fontanelles sinks at its place, causing a visible curvature from outside. Sunken fontanelle can happen due to dehydration and malnutrition (5). A baby can dehydrate due to severe and chronic diarrhea and vomiting while malnutrition occurs when the baby gets inadequate feed.
  1. Bulging fontanelle causes the fontanelle to puff and bulge outwards. You may be able to feel it when you run your hand gently on the baby’s skull. A bulging fontanelle can be a result of buildup of fluid inside the skull or any other complication involving the brain or spinal cord.

Meningitis (infection of the membrane covering the brain), encephalitis (inflammation of the brain), hydrocephalus (accumulation of fluid within the brain), and intracranial occupy lesions (mass) are a few conditions that can make the fontanelle bulge (6). A soft spot can bulge due to injury, which is quite common in infants that experience abusive head trauma (7).

The fontanelle may even bulge when the infant cries or vomits. But if the fontanelle returns to the normal position and if the baby is otherwise healthy, then there is no reason to worry.

  1. Enlarged fontanelles are the soft spots that cover a larger area than they should. This can happen due to several complications and congenital problems including Down syndrome, hydrocephalus, intrauterine growth retardation (IUGR), premature birth, brittle bone disease, hypothyroidism, rickets, and achondroplasia skeletal dysplasia (8).
  1. Craniosynostosis is the condition where the baby is born with fused skull bones and no fontanelles. A lack of soft spot and fused skull bones leaves little space for the brain to expand thus leading to several complications. Faulty genes commonly cause craniosynostosis (9).

Any problem with the fontanelle is a medical emergency, and you must take the baby to the doctor.

You may sometimes feel a pulse on the baby’s soft spot, which is due to the pressure of blood flowing through the blood vessels around the fontanelle. The pulsation will correspond to the baby’s heartbeat and is nothing to worry about (10).

How To Take Care Of A Baby’s Soft Spot?

No special care is needed to protect the fontanelle. But you should take a few precautions and adhere to some best practices for the baby’s safety (3).

  1. Keep baby’s head supported: Babies do not have the necessary neck muscles to keep their head stiff and straight. Leaving the head unsupported may make it flop and cause injury. Remember to support your baby’s head with your hand every time you pick them up and even while holding them in your arms. A sudden jerk or movement is enough to cause head injury, which can lead to problems with the fontanelle as well.
  1. Be watchful of illness: If you suspect something wrong with the fontanelle, including a change in the shape, take the baby to a doctor right away. It helps to catch any problem early, which helps in a timely resolution.

Frequently Asked Questions

1. What happens if I touch the soft spot on a baby’s head?

To protect the baby’s brain, a thick and tough membrane covers the soft spots on the baby’s head, known as fontanelle. As a result, there is no danger in gently touching the soft spot on your baby’s head or if you accidentally brush over it (11).

2. How do I know if my baby’s soft spot is normal?

The soft spots (fontanelle) on the baby’s head are generally flat and soft; sometimes, you can even feel a slight pulsation that is normal. Anything other than these may indicate a problem (12).

A baby’s soft spot or fontanelle occurs due to the presence of connective tissue-filled gaps between the infant’s skull bones. They aid the smooth movement of the baby’s head down the birth canal and also support rapid brain growth. Dehydration of malnutrition can cause the fontanelles to sink, while a bulge may appear due to infections, trauma, or fluid accumulation. Fontanelles eventually close and form a hard skull as the baby grows. Until then, provide ample support to the baby’s head and seek medical attention if you observe any abnormality in the soft spots.

Did you ever notice fontanelles on your baby’s head? Do tell us in the comment section below.

References:

MomJunction's articles are written after analyzing the research works of expert authors and institutions. Our references consist of resources established by authorities in their respective fields. You can learn more about the authenticity of the information we present in our editorial policy.
1. Anatomy of the Newborn Skull. University of Rochester
2. Cranial sutures. U.S. National Library of Medicine
3. All About Baby’s Soft Spot. Nationwide Children’s
4. Fontanelles – sunken. U.S. National Library of Medicine
5. Fontanelles – bulging. U.S. National Library of Medicine
6. Shaken Baby Syndrome. Vermont Official State Website
7. Fontanelles – enlarged. U.S. National Library of Medicine
8. Craniosynostosis. U.S. National Library of Medicine
9. M. Majed, F. Nejat, and M.E. Khashab; Congenital dermoid cysts of the anterior fontanel. National Center for Biotechnology Information
10. Your Baby’s Head. The American Academy of Pediatrics
12. About the fontanelle; Health On The Net (HON) foundation
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Dr. Fadel Husrom

( MD)
Dr. Fadel Husrom is an Arab Board licensed pediatrician in the UAE. He possesses a degree in Pediatrics and master degree in Pediatric Cardiology from Damascus University. He has more than 10 years professional experience in Pediatric and Pediatric Cardiology disciplines. Dr. Husrom is also affiliated with the American Heart Association as a PALS instructor in Zulekha hospital advanced life... more

Rohit Garoo

Rohit Garoo is a zoologist-botanist turned writer with over 8 years of experience in content writing, content marketing, and copywriting. He has also done an MBA in marketing and human resources and worked in the domains of market research and e-commerce. Rohit writes topics related to health, wellness and development of babies. His articles featured on several notable websites, including... more

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