cerebral palsy...what are the factors?

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I have watch earlier a review on some documentaries earlier and somehow it made me sad because it said that 2 babies out of thousands born everyday in the world are having cerebral palsy, I know they are normal mentally, they can understand but cannot be understood, some have slight symptoms of this condition but some really has complicated condition, like for example the other child that they have featured earlier, aside from having cerebral palsy she also have autism and seizures (everyday), that is why I am kinda affected today. But my question is what are the factors that affects this children to have this kind of condition, was it at the early stages of pregnancy of their mothers? was it our modern day living? or was it inherited? I am just sad that every year there is an increasing number of cases of cerebral palsy...kinda sad.