Why do you think there is an increase of kids with autism or sensory disorders?

So I’m very curious about the amount of children with adhd, autism, sensory issues, ect. it seems to be becoming so common place teachers laugh when you mention it. This is not a debate post I’m just guininely curious how many of us have neurodiverse children vs how many neurotypical children now a days. It almost seems that being neurotypical is becoming the rarity. What do you think the reason for the increase is?