I certainly believe we are all born good, but evolutionary traits in our DNA do cause us to be jealous, greedy, and vain as we start to learn about the world. Life has been trying to find ways to survive since the start, so it's not unnatural to have these traits, since as a individual organism, looking out for number one has usually worked out for the best. But at least we are intelligent enough to correct children as they start to grow and learn. I certainly reject (as a irreligious person) the Christian belief of "original sin" and even did when I considered myself a Christian. The dogma that even a child is doomed for hell (without being "saved") is one of the most fundamentally wrong things religion ever came up with.
Do you believe we are all born good?