Some children are not raised in a language-rich environment due to many factors. Sometimes children aren't exposed to much language, which stunts their language development. I know this from experience. My nephew, who is now three, has difficulty speaking and expressing what he wants and what is wrong with him because he hasn't been exposed to much language. His mother suffered from severe depression and for this reason he was not talked to or interacted with much. According to Tonya R. Bergeson, children whose caregivers suffer from depression have more difficulty learning speech because they are spoken to in flat, monotone tones, which is likely to have effects on children's language development. this child (Tanya R. Bergeson, Spoken Language Development in Deaf or Hard of Hearing Infants: The Role of Mother- and Child-Directed Speech, p. 172). My nephew has a vocabulary of barely thirty words when he should have a vocabulary of over two hundred words. He is currently enrolled in language development classes to help him better develop his language skills and vocabulary. If a child is not in an environment that they do not interact with and where a strong language system is not in place, this will cause their language development to be delayed. Language development has everything to do with the environment and how a child is exposed to language. Humans are not born knowing the use of language and grammar,