Curious rambling - baby teeth

As I was driving home from the gym this afternoon, something occurred to me, which I did not feel like researching: why do we have baby teeth that fall out to give way to adult teeth? Is there any evolutionary advantage to not getting a good set of teeth to start out with? How could this have evolved? Are there any other species that experience this phenomenon, or are we unique in this respect?

If you know the answer to any of these questions, or want to speculate about them, feel free to comment. I'd be curious to see what people have to say.
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