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The fear of falling one is interesting. There was a study done on babies that had just entered the crawling stage. They had a large floor and their favorite toy was put on the other side of a glass floor so when the baby got to the edge, it could see far down. The babies would, invariably, NOT crawl over the glass to get toys, their moms or anything else.
As for dark, I have a hard time seeing this as instinctual rather than societal. Kids are often given nightlights, but often only after they are a year or two old. Babies don't seem to mind the dark, it's once kids hear scary stories and know what "monsters" are that they are afraid of the dark.
I also can't really see the reptiles one being instinctual either. In some primates, perhaps, but not in humans. Humans are so far removed from their "natural" state, that fears of animals are developed rather than inherent. Show a baby a snake... bet he/she doesn't get any more or less scared than if you show them a puppy. Maybe here and there, but across a group, I doubt there'd be much difference.
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