The transition to this stage occurs between ages 1 and 4 and may last for weeks or months. It’s characterized by rapid and specific regression of acquired abilities, such as the purposeful hand use and the ability to speak. Characteristic hand movements often begin during this stage.

 

Although eye contact is preserved, they show diminished interest in people and objects. Previously acquired babbling, words and fine motor skills are lost during this period. Slowed head growth is usually noticed during this stage and it’s often difficult for them to move on their own.