Separated sutures are abnormally wide spaces in the bony joints of the skull in an infant.
Separation of the sutures
The skull of an infant or young child is made up of bony plates that allow for growth. The borders where these plates come together are called sutures or suture lines.
In an infant only a few minutes old, the pressure from delivery may compress the head. This makes the bony plates overlap at the sutures and creates a small ridge. This is normal in newborns. In the next few days the baby's head expands. The overlap disappears and disappears and the edges of the bony plates meet edge to edge. This is the normal position.
Diseases or conditions that cause an abnormal increase in the pressure within the head can cause the sutures to spread apart. These separated sutures can be a sign of pressure within the skull (increased intracranial pressure).
Separated sutures may be associated with bulging fontanelles. If intracranial pressure is increased a lot, there may be large veins over the scalp.
Although your provider keeps records from routine checkups, you might find it helpful to keep your own records of your child's development. Bring these records to your provider's attention if you notice anything unusual.
Carlo WA. The newborn infant. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF, eds. Nelson Textbook of Pediatrics. 19th ed. Philadelphia, PA: Elsevier Saunders; 2011:chap 88
Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.