CSET Multiple Subjects Subtest 1 Reading Language And Literature Practice Test

The main idea is the language development that happens in the very first year of life. In this period, babies focus on producing sounds rather than using real words. They start with cooing—soft vowel-like sounds—and then enter a babbling stage, where they experiment with sound combinations that resemble phonemes and syllables. This exploration of sounds, or phonemic babbling, is a hallmark of infancy and early toddlerhood, typically occurring from birth up to about one year. Around the end of this window, many children begin to use their first words, signaling a shift toward meaningful speech. The later intervals—12-18 months, 18-24 months, and 24-36 months—are more about expanding vocabulary and building grammar, not primarily about continued cooing and babbling. So the timeframe that best fits infants and early toddlers focusing on cooing and babbling with phonemes is birth to 12 months.