Children can have difficulty producing sounds and words, leading to unintelligible speech and a hard time being understood by others. Children may misarticulate some sounds as they develop their speech skills. Children are expected to develop and produce sounds individually, in words and in sentences, by a certain age. Most have all the sounds developed by the time they are eight years old. A child who has difficulty with producing certain sounds may have a speech sound disorder. Some conditions that can affect speech and lead to speech sound disorders, include Autism Spectrum Disorder, hearing loss, Down Syndrome or other genetic syndromes, brain damage and Cerebral Palsy.