Babbling typically begins around 6-8 months of age, when babies start to produce repetitive sounds like "ba-ba" and "ma-ma".

Holophrases are single words that are used to express a complete thought or idea. For example, a child might say "ball" to mean "I want the ball".

Children typically start to use two-word combinations, also known as telegraphic speech, around 12-18 months of age. These combinations consist of two words that are grammatically correct but lack function words like "the" and "is".

Children typically start to use complete sentences, with correct grammar and syntax, around 3-4 years of age.

Vocabulary acquisition is the process by which children learn the meaning of words. It involves learning the sounds, spellings, and meanings of words, as well as how to use them in different contexts.

Articulation is the ability to produce speech sounds correctly. It involves the coordination of the lips, tongue, and other speech organs to produce the sounds of language.

Pragmatics is the ability to understand and use language in social situations. It involves knowing how to take turns in conversation, how to use appropriate language in different contexts, and how to communicate effectively with others.

Semantics is the ability to understand the meaning of words and sentences. It involves knowing the denotative and connotative meanings of words, as well as how to interpret figurative language.

Syntax is the ability to combine words into sentences. It involves knowing the rules of grammar, such as how to use verbs, nouns, adjectives, and adverbs correctly.

Morphology is the ability to break words down into their smallest meaningful units, called morphemes. Morphemes can be prefixes, suffixes, or root words.

Apraxia of speech, autism spectrum disorder, and Down syndrome are all common speech and language disorders in children.

Difficulty understanding what others say, difficulty producing speech sounds, and using gestures instead of words are all signs that a child may have a speech or language disorder.

Talking to their child often, reading to their child, and singing songs with their child are all things that parents can do to help their child's speech and language development.

Parents should be concerned about their child's speech and language development if their child is not babbling by 12 months, not using two-word combinations by 24 months, or not using complete sentences by 3 years.

Speech-language pathologists, early intervention programs, and online resources are all resources that parents can use to help their child's speech and language development.