Physiologically, (as I have written about in The Key to Health and Rejuvenation) the number of children affected with autism is closely linked with the toxicity and large number of different vaccinations a child is exposed to fron an early age.
Vaccination as a form of preventing against disease is a fallacy that has no scientific backing at all (see the research cited in my book). Injecting foreign, noxius viral material directly into the blood of helpless babies that have no natural immunity to defend themselves against is bound to have serious consequences on the immune, endocrine, digestive and nervous systems. Nowhere in nature would such an unnatural contact between blood and viruses, dead or alive, be possible, except through phsycial injury. If not immediately, this is enough to seriuously affect the health of a person later in life.
In addition, the coctail of noxious chemcials, additives, neurotoxins, preservatives, heavy metals such as mercury, in vaccines, has far-reaching effects that we are now starting to see reflected in an immunity-impaired population. Also, the diet of mother and child, nowadays, is nutritionally so inadequate and so harmful to sensitive children that it is not surprizing to see so many of them having such a hard time developing their bodies in a natural, normal way.
Spiritually, many souls are coming in right now that volunteered to teach as many people as possible to open their hearts to compassion and unconditional love. This forms a major part of their mission. Inside, the are just as "smart" and healthy as those around them, but there is a problem with mind/body cooordination. They cannot express themselves they way they would like to. So they can become very frustrated and emotional about it. This aspect of their existence is due to karmic reasons, which, however, is not a form of punishment. It actually forces, and helps them develop their inner spiritual nature, which they tried to destroy in previous lives, by harming others and themselves.
Their lives are far from being wasted, as it may appear to be for an outsider. Many parents are starting to see their inner world, and their great wisdom and sensitivity. These autistic children or adults often communicate with other beings from other dimensional realities, such as the dolphin beings, horse beings, angelic beings, a world that is not consciously accessible to most others.
There is a strong sense of urgency and desire by plentitudes of souls to incarnate in human form at this time to raise the world population to a crucial size, necessary to bring about a massive shift in awareness. And it doesn't really matter to them whether they come in sick or not. Just to be born adds momentum to the transformational process.
Andreas