Obesity, Hyperphagia, and Developmental Delay, also known as obhd, is related to early-onset obesity-hyperphagia-severe developmental delay syndrome. An important gene associated with Obesity, Hyperphagia, and Developmental Delay is NTRK2 (Neurotrophic Receptor Tyrosine Kinase 2). Affiliated tissues include uterus and eye, and related phenotypes are seizure and hypotonia