Deafness and hard-of-hearing
People with hearing loss can be divided into four categories: the early deaf, the sudden deaf, the late deaf, and the hard-of-hearing. Those with early deafness are generally born deaf or lose their hearing before the age of three. In contrast, people with sudden deafness abruptly lose their hearing within a short amount of time sometime after toddlerhood.
Developmental Language Disorder
A developmental language disorder (DLD) is a neurocognitive developmental disorder. Children with DLD process language less proficiently. They experience problems with speaking, understanding language, and/or learning sounds, words, and sentences. Additionally, they are often less capable controlling themselves and understanding their own and other people's thoughts and feelings.