The Fontanelle of Newborns: Does Early or Late Closure Matter?
The Fontanelle of Newborns: Does Early or Late Closure Matter?
When newborn babies enter this world, one of the things that parents often pay attention to is the fontanelle of their newborn. The fontanelle, also known as the soft spots on a baby's head, is not just a simple gap but plays an important role in the brain development of the child. So, what is the fontanelle of a newborn? What is the typical closure time for the fontanelle? And does early or late closure of the fontanelle affect the child's health? In this article, we will explore these issues comprehensively, from the structure, role, closure time of the fontanelle to the potential risks that may arise when the fontanelle closes at the wrong time. Particularly, this article will provide useful information for parents from basic to advanced levels, helping them better understand their child's health.
Structure and Role of the Fontanelle in Newborns and Young Children
Before seeking answers to the question "Is it concerning if the fontanelle of a newborn closes early or late?", let's understand what the fontanelle of a newborn is and its roles.
1. What is the Fontanelle of a Newborn?
When a baby is born, the skeletal system and structure are not yet fully developed like that of an adult, especially the bones in the head area. At that time, mothers can feel the soft area on the baby's head known as the fontanelle. The fontanelle of a newborn, also called the anterior fontanelle, has a fibrous membrane structure that connects the bones of the head together. Because when the baby is born, the joints between the pieces of skull bone have not yet fused, the bones of the skull cap are not fully closed, leaving gaps known as sutures. The depressed area between these sutures is called the fontanelle.
Newborns have a total of 6 fontanelles, but typically only the 2 larger ones are of concern: the anterior fontanelle (Bregma) and the posterior fontanelle (Lambda). Additionally, there are 4 other smaller fontanelles located in the sphenoid and occipital bones, which are rarely mentioned due to their small size and rapid closure, making them almost undetectable.
2. Distinguishing Between the Anterior and Posterior Fontanelles
The fontanelle of a newborn acts as an elastic space, protecting the brain from external pressure. The anterior fontanelle is the gap between the parietal bones and the frontal bone, shaped like a diamond, and is often referred to by mothers as the "evil beak". Notably, the anterior fontanelle is the largest and most easily palpable, with a size that changes in the first days after birth, ranging from 0.6 to 3.6 cm, with an average of 2.1 cm. The fontanelles of preterm and full-term infants are similar in size.
So where is the posterior fontanelle of a newborn located? The posterior fontanelle is the gap between the parietal bones and the occipital bone, shaped like a triangle. The size of the posterior fontanelle is not as large as the anterior fontanelle because it is already nearly closed or very small, about the size of a fingertip, at birth.
During labor, the baby must pass through the mother's pelvic bones and vagina, causing the baby's head to be compressed. At this time, thanks to the flexible anatomical structure of the fontanelle, the skull bones can adjust, and the elastic gaps help prevent pain for the baby. Without these fontanelles, newborns would be at risk of bleeding in the brain, around the eyes, and in the membranes. Therefore, mothers may notice that the baby's head appears slightly elongated right after birth, but it will become shorter and rounder after some time.
As the baby’s brain develops in the early years, the brain size gradually increases, and the skull expands accordingly. The fontanelle of a newborn also serves as an elastic space, protecting the brain from external pressure. In the early stages of life, babies are more prone to falls and head injuries, especially when they start to roll over, crawl, or stand. The fontanelle acts as a cushion when the baby falls, reducing the risk of brain injury.
When Does the Fontanelle of a Newborn Normally Close?
The question that many mothers often ask is how long it takes for the fontanelle of a newborn to close, and when does it close? Simply put, the fontanelle is considered closed when mothers can no longer feel it on the baby's head. Typically, the posterior fontanelle of a newborn will close first, usually around 4 months. The anterior fontanelle closes later, averaging around 10 to 14 months, and will be completely closed usually before the child reaches 24 months.
Normal Closure Times for the Fontanelle of Newborns
By 3 months after birth, the closure rate of the anterior fontanelle is 1%.
By 12 months, this rate will be 38.8%, and by 24 months, 96% of children will have closed fontanelles.
Therefore, if the fontanelle of a child closes before 2 years old, it is considered normal.
Is Early or Late Closure of the Fontanelle Concerning?
The condition of early or late closure of the fontanelle is usually assessed through the anterior fontanelle. Whether the fontanelle of a newborn closes early or later than the normal time can reflect potential health risks that the child may be facing. If mothers notice that their child does not have a palpable anterior fontanelle by 3 months, it is considered early closure, while if it is still present after 2 years, it is considered late closure. In these cases, mothers need to take the child for a check-up to determine the cause and find a treatment method.
1. Causes of Early Closure of the Fontanelle
In cases of early closure of the fontanelle, the cause may be due to some reason that leads to premature ossification of the child's skull, such as vitamin D deficiency, certain genetic disorders, or conditions like Crouzon syndrome or Apert syndrome. This condition can negatively impact brain development, as the brain does not have enough space to develop normally.
2. What Issues Can Early or Late Closure of the Fontanelle Cause?
2.1. Early Closure of the Fontanelle
The consequences of early closure of a newborn's fontanelle include hindering brain development, potentially causing head deformities, negatively affecting the development of the skull and brain, reducing cognitive abilities, or even causing increased intracranial pressure, which can affect the development of motor and mental skills later on. Early closure of the fontanelle can lead to the child's head becoming misshapen or uneven, causing difficulties in daily life.
Since the size of a child's brain increases rapidly, the brain volume of a 6-month-old child has already doubled compared to when they were born and continues to triple by the time the child is 24 to 30 months old. The fontanelle and elastic membranes are the factors that facilitate the skull's adaptation to the rapid development of the brain.
2.2. Late Closure of the Fontanelle
Late closure of the fontanelle in newborns is also an abnormal condition, indicating a slow ossification of the bones. Possible related causes include growth hormone deficiency, genetic disorders, or even nutritional issues. Late closure of the fontanelle can lead to the child's head being too large, causing pressure on the brain and leading to developmental issues in mental and motor skills.
Ways to Monitor the Fontanelle of Newborns
To monitor the development of the fontanelle, parents can take the following steps:
Regularly check the anterior and posterior fontanelles of the child. If any abnormalities are detected, promptly take the child to the doctor.
Ensure a complete nutritional regimen for the child, with necessary vitamins and minerals, especially vitamin D.
Consult with a doctor regularly to monitor the child's development.
Best Practices for the Development of the Newborn's Fontanelle
To ensure the normal development of the newborn's fontanelle, parents should implement the following measures:
Care for the child properly, avoiding excessive impacts to the head.
Encourage physical activity to help develop motor skills.
Ensure a balanced and nutritious diet for the child.
Regularly take the child for health check-ups to monitor the development of the fontanelle and brain.
Consulting with Experts
“Monitoring the development of a newborn's fontanelle is very important, as it not only reflects the development of the skull but also affects the future intellectual and physical development of the child.” – Pediatric Specialist.
Conclusion
The fontanelle of a newborn plays a crucial role in brain development and the overall health of the child. Both early and late closure of the fontanelle can lead to serious health issues for the child. Therefore, parents need to pay attention to monitoring the development of the fontanelle, ensuring a complete nutritional regimen, and regularly taking the child for health check-ups. This not only helps the child develop normally but also aids in the early detection of potential health issues. With the information in this article, we hope parents will gain the necessary knowledge to care for and protect the health of their newborns.
Frequently Asked Questions about the Fontanelle of Newborns
1. When is it normal for the fontanelle of a newborn to close?
Typically, the posterior fontanelle will close first, around 4 months after birth, while the anterior fontanelle closes later, around 10 to 14 months after birth, and will be completely closed before the child is 24 months old.
2. Why is the fontanelle important?
The fontanelle helps protect the baby's brain in the early months of life, allowing the skull bones to expand to accommodate the rapid growth of the brain, as well as minimizing injuries when the baby falls.
3. How can I monitor the development of the fontanelle?
Parents can monitor by regularly checking the fontanelle, ensuring a complete nutritional regimen for the child, and taking the child for regular health check-ups to monitor the development of the fontanelle and brain.
4. Is early closure of the fontanelle dangerous?
Yes, early closure of the fontanelle can hinder brain development and cause health issues such as head deformities or increased intracranial pressure.
5. What if the fontanelle closes late?
Late closure of the fontanelle can also be a sign of health issues, such as growth hormone deficiency or genetic disorders, and should be examined by a specialist.