Jargon develops out of babbling at about 10 months and continues after the child begins to use meaningful words. They seem to be using a gestalt strategy for producing large chunks of speech, but they don't have the meaningful words or the syntax. Some children use very little jargon. They use single words or combinations of words to get their point across until they are able to put meaningful words into sentences. Babbling and jargon can be viewed as the child's prespeech sound practice.
Children produce babbling and jargon with adults, toys, in bed, etc .