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microcephaly
A neurological disorder in which the circumference of the head is smaller than average for the age and gender of the infant or child.

Microcephaly may be congenital or it may develop in the first few years of life. The disorder may stem from a wide variety of conditions that cause abnormal growth of the brain, or from syndromes associated with chromosomal abnormalities.

Infants with microcephaly are born with either a normal or reduced head size. Subsequently the head fails to grow while the face continues to develop at a normal rate, producing a child with an abnormally small head, a large face, a receding forehead, and a loose, often wrinkled scalp.

As the child grows older, the smallness of the skull becomes more obvious, although the entire body also is often underweight and dwarfed. Development of motor functions and speech may also be delayed.