What is the size of the fontanel? The fontanel, also called \”anterior fontanel\” and \”posterior fontanel\”, refers to the connection between the two brain bones on the baby\’s skull that have not yet completely healed. The anterior fontanelle is the fontanel at the top of the head, and the posterior fontanelle is the fontanelle at the back of the head. Fontanel size refers to the diameter and length of the fontanel, which can reflect the baby\’s brain development. The normal range of fontanel size varies according to age and gender. The following will learn about the precautions for fontanel size from many aspects. How to measure the size of the fontanel. Among the things to note when understanding the size of the fontanel,