The Neonatal Behavioral Assessment Scale (NBAS) is a standardized developmental screening test used to examine differences in newborn behavior. It assesses domains like autonomic functioning, motor skills, state regulation, and social interaction through observation of behavioral and reflex items. The NBAS can be administered to full-term infants aged 37-48 weeks by trained medical professionals. It provides information on infants' ability to handle stress and self-organize that can help supplement childcare and promote healthy development.