RT Book, Section A1 Hay, Jr, William W. A1 Levin, Myron J. A1 Deterding, Robin R. A1 Abzug, Mark J. SR Print(0) ID 1145457132 T1 Microcephaly T2 Quick Medical Diagnosis & Treatment Pediatrics YR 2017 FD 2017 PB McGraw-Hill Education PP New York, NY SN 9781264257614 LK accesspediatrics.mhmedical.com/content.aspx?aid=1145457132 RD 2024/10/14 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