When does the posterior fontanel typically close?

Prepare for the HOSA Human Growth and Development Test with multiple choice and flashcard study options. Each question includes helpful hints and explanations. Ready yourself for exam success!

The posterior fontanel typically closes by the fourth month of an infant’s life. This soft spot on the back of a baby's head is made up of membranous tissue and allows for the baby's skull to be flexible during birth. The closure reflects the normal progression of skull development and the expansion of the brain that occurs in early infancy. The closure at around four months helps to reinforce the protection of the brain as it grows and develops, while also allowing for the necessary changes in the shape of the skull that occur during this growth period. It's important to understand that the timing of fontanel closure can vary slightly among individuals, but the fourth month is the average benchmark for the posterior fontanel.

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