I think that differences in children's development is not noticed as much by parents who have children born farther apart. When children are close in age, it's a lot easier to see when one is not developing as the other did, and therefore parents are more likely to seek a diagnosis. However, I do not quite believe the rest of the theories that are being postulated in the article
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If I tell you I'm unique, and you say, "Yeah, we all are," you've missed the whole point.
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RAADS-R: 187.0
Language: 15.0 • Social Relatedness: 81.0 • Sensory/Motor: 52.0 • Circumscribed Interests: 40.0
Your neurodiverse (Aspie) score: 165 of 200
Your neurotypical (non-autistic) score: 47 of 200
You are very likely neurodiverse (Aspie)