Autism
Neurodevelopmental Disorders & Learning Differences
Key Takeaways
- Childhood Disintegrative Disorder (CDD) is a rare developmental condition in which a child who developed typically for at least the first 2 to 3 years of life suddenly loses previously acquired skills in areas such as language, motor abilities, social interaction, and bladder or bowel control.
- Under the DSM-5, CDD is now considered part of Autism Spectrum Disorder, though it was previously categorized as a distinct disorder because of its late onset and severe regression.
- CDD differs from traditional autism in three key ways: a later onset (typically between ages 2 and 10), a sudden and rapid loss of skills rather than gradual challenges, and a more severe, widespread impact on multiple areas of development at once.
- Today CDD is generally diagnosed as Level 2 or Level 3 ASD, depending on the severity of the individual's support needs.
- Because symptoms can develop suddenly over days or weeks, it is essential to seek evaluation by a pediatric neurologist or developmental specialist as soon as possible.
Authored by: The DrSensory Editorial Team
Reviewed by: 🛡️ DrSensory Clinical Review Board
Last updated: June 2026
Frequently Asked Questions
What is Childhood Disintegrative Disorder (CDD)?
CDD is a rare developmental condition marked by a dramatic loss of previously acquired skills in children who had typical development for at least the first 2 to 3 years of life. These children suddenly regress in areas such as language, motor skills, social interaction, and bladder or bowel control.
At what age does Childhood Disintegrative Disorder usually begin?
CDD symptoms typically begin between ages 2 and 10, after a period of normal development.
How is CDD different from typical autism?
Unlike most autism, CDD involves a later onset and a rapid, noticeable loss of skills rather than gradual developmental challenges. The decline is often more extreme and widespread, affecting multiple areas of development at once.
What are the signs and symptoms of CDD to watch for?
Key signs include loss of speech and language skills, loss of motor abilities like walking or coordination, loss of social engagement such as eye contact and interest in peers, regression in self-care skills including toilet training, and the emergence of repetitive behaviors, anxiety, or sensory sensitivities.
Who should evaluate my child if I notice a sudden loss of skills?
Because CDD symptoms often develop suddenly over days or weeks, it is essential to seek evaluation by a pediatric neurologist or developmental specialist as soon as possible.
