A nutrition, metabolism, and development symptom that is characterized by the delay in development child's cognitive, emotional, motor, and social capacities from the beginning of life throughout fetal and neonatal periods, infancy, childhood, and adolescence. [ url:https://pubmed.ncbi.nlm.nih.gov/23622146/ url:https://www.webmd.com/parenting/baby/recognizing-developmental-delays-birth-age-2 ]