Microcephaly

**Definition:** A condition caused by failure of the head to correctly develop during the antenatal period. This condition is characterised by a head size that is significantly smaller than normal for their age and sex. This condition may also present with developmental delays, difficulties with balance and coordination, short stature, hyperactivity, mental retardation, seizures, or other neurological abnormalities.

**Inclusions:** - Micrencephaly

**Exclusions:** - Syndromes with microcephaly as a major feature