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Baio J, Wiggins L, Christensen DL, et al. Prevalence of Autism Spectrum Disorder Among Children Aged 8 Years — Autism and Developmental Disabilities Monitoring Network, 11 Sites, United States, 2014. MMWR Surveill Summ 2018;67(No. SS-6):1–23. DOI:

Centers for Disease Control and Prevention Website. National Center on Birth Defects and Developmental Disabilities. Learn the Signs. Act Early. Important Milestones: Your Child at Two Years. Available at: Accessed August 8, 2011.

First Signs Website. Hallmark Developmental Milestones. Available at: Accessed: August 8, 2011.

Howlin P, Asgharian A. The diagnosis of autism and Asperger syndrome: findings from a survey of 770 families. Dev Med Child Neurol. 1999;41:834-9.

Johnson CP, Myers SM. Council on Children with Disabilities. Identification and evaluation of children with Early Warning Signs of Autism Spectrum Disorder. Pediatrics. 2007;120(5):1183-215.

Lord C, Luyster R, Guthrie W, Pickles A.  Patterns of developmental trajectories in toddlers with autism spectrum disorder.  Journal of Consulting and Clinical Psychology.  2012;80(3):477-489.

Mandell DS, Maytali MN, Zubritsky CD. Factors associated with age of diagnosis among children with autism spectrum disorder. Pediatrics. 2005;116(6):1480-6.

Martinez-Pedraza F.d.L., Carter A. Early Warning Signs of Autism Spectrum Disorder in young children. Child Adolesc PsychiatrClin N Am. 2009;18:645-63.

Rogers SJ. Developmental regression in Early Warning Signs of Autism Spectrum Disorder. Ment Retard Dev Disabil Res Rev. 2004;10:139-43.

Steiner AM, Goldsmith TR, Snow AV, Chawarska K. Practitioner’s guide to assessment of Early Warning Signs of Autism Spectrum Disorder in infants and toddlers.  Journal of Autism and Developmental Disorders. 2012;42:1183-1196.

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