Language development varies considerably from child to child, even within the same family during the ages 2 to 5. Some preschoolers develop language skills at a steady rate. Others master words in an uneven manner. Some children are talkative while others are quiet. Boys often start talking later than girls, but this evens out by school age. A 2-year old may begin with a starter vocabulary of 2-word micro-sentences. By the time the child turns 5, they have a 2,500 word vocabulary and complete sentences are usually spoken.

Between 2 and 3 years, four and five word sentences are used. Almost all common objects and pictures can be recognized and identified. Pronouns are used as are some plurals (dogs, cats). Strangers can understand most words.

Between 3 and 4 years, language allows the child expression of thoughts. Some degree of hesitancy and uncertainty is common at this age. The greater a child's ability to speak and understand words, the easier it is to think, create, and tell their parents. Basic rules of grammar are mastered. Sentences are composed of 5 to 6 words and stories are told.

Between 4 and 5 years, complex sentences use up to eight words. "Why?" and "who?" are asked. Most colors are known. Past, present, and future forms of verbs and the difference between single and plural nouns are understood. Swear words are usually picked up at this age, although their meaning may not be known. Longer stories are told and so are the child's dreams and fantasies. Most of the time, parents can understand what their child says.

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