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Proposed Changes to Babbling page
editI will be adding an "Abnormal Development" section of the babbling page.
Source: Salkind, N. J. (2006). Encyclopedia of human development. Thousand Oaks, California: Sage Publications, 2006.
Typically by 6 month of age, all normally developing children will babble. (Salkind,151) However, infants with certain medical conditions or developmental delays may have a delay or an absence of babbling.
For example, infants who have had a tracheotomy typically do not babble (Salkind 152) Following decannulation, it has been found that infants do produce more vocalizations, but the sounds or syllables are not as diverse as those found in typically developing infant's canonical babbling behaviour. (Locke 1989) -->link to tracheotomy page. Locke, J. L. (1989). Babbling and early speech: continuity and individual differences. First Language, 9(26), 191. doi:10.1177/014272378900902606
Infants with severe apraxia may not babble, and may fail to produce first words. Communication by infants with apraxia may solely be in the form of grunting and pointing. (152) Find an additional source & link to apraxia page
Infants with autism may have a delay in babbling, and in some cases it may be completely absent. (Salkind 152) Babbling in children with autism tends to occur less frequently than in typically developing children, and with a smaller range of syllables produced during the canonical babbling stage. (below citation)
Patten, E., Belardi, K., Baranek, G., Watson, L., Labban, J., & Oller, D. (2014). Vocal Patterns in Infants with Autism Spectrum Disorder: Canonical Babbling Status and Vocalization Frequency. Journal Of Autism & Developmental Disorders, 44(10), 2413-2428. doi:10.1007/s10803-014-2047-4 (I will be looking here to fill in additional information)
Babbling may also be delayed in individuals who are born with Down syndrome. The canonical stage may emerge 2 months later than other infants, although, when produced, it is similar to babbling in normally developing infants. (Salkind,152)