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Ages that are the most critical for speech development during the preschool years are 3 and 4 years

The brain develops and matures over the first three years of life, making this the most intensive time for speech and language development. It is optimal for these talents to develop in a world that is full of diverse noises, sights, and regular exposure to other people's speech and language. There seem to be key developmental stages for speech and language in infants and young children when the brain is most receptive to language. Learning will be more challenging if these crucial times are allowed to pass without language contact.

When a baby discovers that a cry will bring food, comfort, and company, the earliest indications of communication appear. Additionally, newborns start to notice significant sounds in their surroundings, such as their mother's or primary caregiver's speech. Babies start classifying the speech sounds that make up the words of their language as they get older. Most babies can identify the fundamental sounds of their native language by the age of six months. The rate at which children acquire speech and communication abilities varies. However, they adhere to a natural sequence or schedule for developing linguistic skills.

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