My DS was diagnosed with autism a week after he turned 3. We have never kept this diagnosis from him. Once we got the official diagnosis, we became very involved in the autism community, attending special events, playgroups, support groups, etc. DS has Hyperlexia (early reading combined with difficulties processing verbal language) as a feature of his autism, so he started reading at age 2, before he could even talk. We had books and articles about autism all over our house as DH and I tried to understand this new diagnosis. So DS has always been exposed to the word “autism” and known that it is something that applies to him. I don’t think we could have hidden the word from him if we had tried.  As DS grows, we explain more and more about what it means. In reality, the hard thing hasn’t been telling DS that he has autism; it has been explaining to him that other people do not have autism.  DS is 7 (almost 8) and knows that autism means his brain works differently from other kids. He knows that it makes some things (like reading and math) easier for him and other things (like conversations and games) harder for him. Still, it’s a gradual process of him learning what autism is. Now he is at an age where his differences from typical kids are becoming more obvious, both to him and to other children. So we’ve been doing a lot of work helping him understand these differences.
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DS also has albinism, a pigment disorder that always involves some degree of vision impairment. DS’s vision impairment is relatively mild for someone with this condition, but it does have significant impact on his life, both in and out of school. DS is aware of this condition too. He knows that albinism is why he needs to protect his skin and eyes from the sun and why he had difficulty seeing some things, even with his glasses.Â
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There are several reasons why we never shielded DS from his diagnosis. One is that it simply wasn’t practical, since we attend special needs events and have books/articles in our home. Another was that by introducing the terms for his disorders early on we could avoid the shock of discover later. We feel that it is better for him to come to full knowledge and understanding gradually over time. In a way, this isn’t much different than teaching DS about our religion. He knows that he is Catholic and enjoys being a part of the Catholic community. He understands that not everyone is Catholic. But he doesn’t understand everything about being Catholic. Instead he learns the faith gradually.
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Another reason we are open with DS about his disorders is that we work with him on self-advocacy. Part of DS being able to advocate for himself is him understanding his own needs and how these needs differ from those of other kids. Even at his young age we have seen him do basic but powerful acts of advocating for himself.  He was even able to get the school to make changes that I had spent months arguing for with no success.  I was so proud of him.
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(Sorry for the length.)