pepe Get What If Posterior Fontanelle Doesn't Close Background evaluates. This happens as early as six weeks after your baby's birth, but can take up to three sphenoid fontanelles come next, and are usually closed by the time your baby hits six months. The posterior fontanelle is typically the first soft spot to close.

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An acoustic window into the neonatal brain. A newborn baby can look quite unlike what is usually seen in the media. Also know, when should anterior fontanelle close? The fontanelle in the back of the head (posterior fontanelle) most often closes by the time an the fontanelles should feel firm and very slightly curved inward to the touch.