Why do you think there is so much disagreement about what causes autism?

Autism - It is also called Autism Spectrum Disorder that comes under the umbrella of Neurodevelopment disorder caused by both genetically and environmentally. Usually its recognizable in early childhood in second 6 months and continous through an adult life. Child faces issues in communication like abnormal hearing capacity, delayed speech, unusual speech pattern, idiosyncratic use of phrases. they may speak too loudly or lack of prosody means a tone or pitch of how you ought to speak in a certain environment. In Autism speaking skills are not developed so generally they cannot speak or reduce speaking.