Some children are talkative while others are quiet. Boys often start talking later than girls, but this evens out by school age. 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.
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.