When did you first notice that the baby's head seemed large?
Does the baby's head size seem to be increasing faster compared to the growth of the body?
Does the head seem larger all over?
Is the head growing more in a front-to-back pattern or in a side-to-side pattern?
What other symptoms are present (especially changes in brain or nervous system functions)?
A careful physical exam will be done. Other milestones for growth and development will be checked.
In some cases, a single measurement is enough to confirm that there is a size increase that needs to be tested further. More often, repeated measurements of the head circumference over a period are needed to confirm that the head circumference is increased and the problem is getting worse.
Cohen MM Jr. Overgrowth syndromes. In: Gilbert-Barness E, Kapur RP, Oligny LL, et al., eds. Potter's Pathology of the Fetus, Infant and Child. Philadelphia, PA: Elsevier Mosby; 2007:chap 41.
Kinsman SL, Johnston MV. Congenital anomalies of the central nervous system. In: Kliegman RM, Stanton BF, St. Geme JW III, et al., eds. Nelson Textbook of Pediatrics. 19th ed. Philadelphia, PA: Elsevier Saunders; 2011:chap 585.
Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Bethanne Black, and the A.D.A.M. editorial team.