Childhood Disintegrative Disorder (CDD) is a rare condition that affects young children, typically between the ages of 2 and 4. Initially, these children develop normally, reaching typical milestones in language, social skills, and motor abilities. However, they may suddenly lose these skills, leading to significant challenges in communication, social interaction, and daily activities. The exact cause of CDD is not well understood, but it is considered part of the broader category of autism spectrum disorders. Children with CDD may also exhibit repetitive behaviors and have difficulty adjusting to changes in their environment. Early intervention and support can help improve their quality of life.