Cherry (2012), "researchers have found that language development begins before a child is even born, as a fetus is able to identify the speech and sound patterns of the mother's voice" (p. 4). After children are born they go through different stages as one develops language. The first stage is the prelinguistic, babbling or cooing stage, occurring between the ages of 3 and 9 months. The second stage is one-word or holophase stage of language development, occurring near the ages of 10 to 13 months. The third stage is the two word sentences stage, occurring around the age of 18 months. The fourth stage or multi-word sentence stage, occurs around the age of two. While child ages, one continues to learn more new words every day, and by the time one enters school near the age of five, one typically has a vocabulary of 10,000 words or more (Cherry, 2012).
Cherry, K. (2012). About.com, Psychology. Retrieved from http://psychology.about.com/od/developmentalpsychology/ss/early-childhood-development_4.htm