Over 100 genes are considered high-risk
Part of answering the question of when autism is developed is looking into what its causes are. For a long time, even the top experts were not able to answer this question; however, more progress has been made as of late.
An important piece of information to note is that there are different types of autism, and as such, there are different causes.
Researchers have put together data to find that rare gene changes and mutations are associated with autism, totaling over a hundred genes that are of particularly high risk.