Regressive behavior is a known sequela after severe traumatic brain injury (TBI). However, prolonged "infantile-like" behavior has received little attention in the literature, suggesting that this is a rare phenomenon. It is typically characterized by long-lasting childish, extremely dependent, and sometimes aggressive behavior, which is distinguished from the expected recovery process. The relevant theoretical framework lies in the field of disorders called "Neuropathologies of the self" (NPS). We report three cases of young adults who, following a severe TBI, developed continual regressive behavior. The Disability Rating Scale (DRS) was used to assess possible change in their condition. First, while admitted, which was performed in retrospect, and again 6 years later at the time stated.