What book is this ? you can find the answer in the text
Thats an opinionated question though
The answer is early and extensive behavioral treatment. Studies show that early intervention for children with autism helps enhance their mental and intellectual ability plus it also diminishes symptoms of autism. This treatment involves Early Start Denver Model, which is intended to promote social skills and learning. Researchers found out the 2yrs after completing the treatment, these children showed overall progress in their communication and intellectual abilities.
<span>Sadie lacks object permanence. Object permanence means that objects still exist even when they cannot be viewed. It not unusual for Sadie to lack object permanence because it is not something infants possess. Infants gained the ability as they grow older through touching objects and holding the objects they think stopped existing.</span>
