Now in America, no longer are children given such precise classification, but rather are generally called developmentally delayed children. This is because it is hard to measure a child before five and secondly because they don't want to reach conclusions about them to soon.
當今美國特教中並不把各類障礙細分類別，而是籠統地稱這一類兒童為發展遲緩兒（developmentally delayed children，原因其一是兒童在五歲前的發展頗難推測，其二是不想太早給他們下結論。