at 24 months children should have a vocabulary of 40-60 words, most children average out at 50 words. Until a child has established this core vocabulary of at least 40 words they will not start to mutter 1-2 word utterances. For example, dada would be a core word vocabulary, dada up would be the next step up in language, and dada up please would be next. All children are different, but if you're child is older then 24 months and doesn't have a core vocabulary (at least 40 words) there's reason to be concerned. By 30 months the average child has well established 1-2 word utterances and should be working on sentences, although very grammatically incorrect (this mines toy meaning that toy is mine). Connector words like the, and, is are not considered important in the development of language and come when the child figures out the "rules and laws" of the spoken language.
at 5:28 PM on Jun. 21, 2009