Rett syndrome (RTT) is a disorder of the nervous system. This condition leads to developmental problems in children. It mostly affects language skills and hand use.

Features include:

• Lack of coordination.
• Flaccid muscles/stiffness.
• Repetitive movements.
• Breathing disturbances.
• No speech.
• Lack of understanding,
• Teeth grinding.
• Hand flapping, clapping, mouthing, etc.