After the babbling stage, she shut up, listened, and put it all together in her head. Obviously, if you have a nonverbal child, rule out the worst possibilities before relaxing and waiting. It was even pointed out to me at the time that some remarkably brilliant adults were late talkers, but all of the examples were men. Females are notoriously early and competent talkers, while male children as a group tend to talk later. There are two verbal styles that have been identified in small children.
Referential children talk about objects, while expressive children talk about feelings and needs.
Referential children get large vocabularies rather quickly compared to expressive children because we simply have more words for things than social labels. This is a way of talking that uses short sentences, clear word boundaries, exaggerated expressiveness, and a higher pitch than usual. While it is unusual to think of CDS as a ZONE, I agree with Berk and applaud her insight into this matter. If you are ready to take your chapter quiz, please click on this sentence.