Most retarded children babble during the first year and develop their first words within a normal time span, but are then slow to develop sentences or a varied vocabulary.
They should also consult with their doctor if the child does not babble or begin to use single words within the normal time frame.
By six months, he should gurgle, laugh, babble repetitive sounds and attempt to imitate them, look for the source of sounds such as a parent's voice and begin to pay attention to music.
However, deaf children born to parents who use sign language develop infant babble and a fully expressive sign language at the same rate as hearing children.
Expressive language development-A style of language development in which a child's babble mimics the cadence and rhythm of adult speech.
Mentally impaired children usually babble during their first year and may speak their first words within the normal age range.
Deaf children born to signing parents begin to "babble" in sign at the same point in infancy that hearing infants babble speech, and proceed from there to learn a fully expressive language.
Babble -- Aside from having a fun name, this style introduces a classic style to a frivolous and feminine color scheme.
The deaf child exposed only to speech will usually begin to babble ("baba, gaga") at a slightly later point than the hearing child.
Disraeli characteristically dismissed it as coffee-house babble, but official investigation proved the substantial accuracy of the reports which had reached England.