I'm seriously offended by the word 'defect'. Some of the so-called defective people are also geniuses, many whom have made the world a better place. I'm not saying that all people with ASDs have hidden talents. But if ASDs had been gotten rid of within the last century, I doubt there would be any computers for us to be having this conversation with or they'd be way different from what they are. Remove the ASD and you remove the genius too. Of course, for some their ASD is a huge hindrance to daily living, but I firmly believe we need to find ways to help them work with it, not make them feel less perfect.
I took a look at the list of conditions that the oganisation can provide info on. One of the conditions I remember seeing was cystic fibrosis. Now, I'm not an expert on the matter, but as far as I know CF, has a known genetic cause. There are several variations of CF, but we know it's hereditary and nothing to do with environmental toxins, etc. Why is this organisation dealing such conditions, if their aim is to prevent them? At the moment, the only way to prevent a baby being born with it is by embryo selection or termination. There's no cure, but it can be treated and a cure is hoped for. I would not term this as a birth defect at all, it's a genetic illness/ condition.
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"We act as though comfort and luxury were the chief requirements of life, when all we need to make us really happy is something to be enthusiatic about." Charles Kingsley