What factors are known or are being hypothesized by the scientific community to cause Autism?

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What factors are known or are being hypothesized by the scientific community to cause Autism?

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What modern science knows about autism is still limited in scope, but we have a general understanding that the cause of autism is a lack of synaptic pruning occurring in the neurons (nerve cells) of the body and brain of someone with autism, and that lack of pruning and the degree of its presence in different areas helps to explain the wide variety of ways in which autism presents itself in individuals. Basically, during late gestation and early development, babies have a bunch of unnecessary synaptic connections (connections between nerve cells) and over time some of those unused and useless connections get pruned away like overgrown limbs on trees. For people with autism, scientists have observed that this pruning never happened, or happened to much smaller degree than is typical, and so the cells of the nervous system act in unpredictable ways. This is why there are so many ways that an autism spectrum disorder can present itself.

I was watching a video about autism and they were saying that there may be a link between autism and antibiotics. We use antibiotics a little excessively these days and it can harm your gut microbiome which in turn can affect your brain development.