Patient's question:
NoDoctor's answer:
The fontanelle refers to the two soft spots on a baby's head at birth, where the bone has not yet fully developed, medically known as "fontanelles." The posterior fontanelle generally closes within 3 months after birth, while the anterior fontanelle typically takes until 18 months to close. The "sky window" or "fontanelle" commonly mentioned primarily refers to the anterior fontanelle. It reaches its maximum size of about 2.5-3 centimeters around 6 months, after which it gradually decreases as the cranial bones continue to ossify. In some children, the anterior fontanelle may close by the age of 1, and in the latest case, it should close by 18 months.