TY - CHAP M1 - Book, Section TI - Microcephaly A1 - Hay, Jr, William W. A1 - Levin, Myron J. A1 - Deterding, Robin R. A1 - Abzug, Mark J. PY - 2017 T2 - Quick Medical Diagnosis & Treatment Pediatrics AB - Head circumference more than 2 standard deviations below the mean for age and sexNearly always associated with developmental delay and learning difficultiesPrimary microcephaly is present at birthSecondary microcephaly develops postnatally SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/10/05 UR - accesspediatrics.mhmedical.com/content.aspx?aid=1145457132 ER -