AbstractThis review provides an overview and definition of the concept of neurobehavior in human development. Two neurobehavioral assessments used by the authors in current fetal and infant research are discussed: the NICU Network Neurobehavioral Assessment Scale and the Fetal Neurobehavior Coding System. This review will present how the two assessments attempt to measure similar processes from pre to post‐natal life by examining three main components of neurobehavior: neurological, behavioral and stress/reactivity measures. Assessment descriptions, strengths and weaknesses, as well as cautions and limitations are provided. © 2005 Wiley‐Liss, Inc. MRDD Research Reviews 2005;11:1