What is the type of speech used by young children in which words are left out but meaning can still be understood?

The type of speech used by young children where words are left out but meaning can still be understood is called telegraphic speech.

Here's why it's called that:

* Short, simple sentences: Just like telegrams, these sentences are very short and to the point, often only containing the essential words.

* Focus on content words: They focus on the important "content" words like nouns and verbs, leaving out less important words like articles (a, an, the) and prepositions (on, in, under).

Examples of telegraphic speech:

* "Want juice" instead of "I want some juice."

* "Go park" instead of "Let's go to the park."

* "Doggie big" instead of "The doggie is big."

Telegraphic speech is a normal stage of language development and usually occurs between the ages of 18 months and 2 years old. It shows that children are starting to understand grammar and sentence structure, even if they don't yet have all the words or rules mastered.