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Parents who have a deaf child typically do not know a signed language, the logistical problem becomes how to give that child exposure to language that the child can access. Without a method of communication between the child and parents, facilitating their child's social skill development at home is more difficult.
Knowing when a speech sound should be accurately produced helps parents and professionals determine when child may have an articulation disorder. There have been two traditional methods used to compare a child's articulation of speech sounds to chronological age.
Around 9–10 months, babies can imitate non speech sounds, and speech-like sounds if they are in the child's repertoire of sounds. [14] Infant babbling begins to resemble the native language of a child. The final stage is known as conversational babbling, or the "jargon stage".
Baby talk is a type of speech associated with an older person speaking to a child or infant. It is also called caretaker speech, infant-directed speech (IDS), child-directed speech (CDS), child-directed language (CDL), caregiver register, parentese, or motherese.
Babies can recognize their mother's voice from as early as few weeks old. It seems like they have a unique system that is designed to recognize speech sound. Furthermore, they can differentiate between certain speech sounds. A significant first milestone in phonetic development is the babbling stage (around the age of six months).
This is extremely useful in the understanding of speech production because speech can be transcribed based on sounds rather than spelling, which may be misleading depending on the language being spoken. Average speaking rates are in the 120 to 150 words per minute (wpm) range, and same is the recommended guidelines for recording audiobooks.
At 6 months, infants are also able to make use of prosodic features of the ambient language to break the speech stream they are exposed to into meaningful units, e.g., they are better able to distinguish sounds that occur in stressed vs. unstressed syllables. [10]
The only language where such sounds are known to be contrastive in normal vocabulary is the extinct ritual language Damin (also the only language outside Africa with clicks); however, Damin appears to have been intentionally designed to differ from normal speech.