I vote at birth too. But only because it's a nice neat place to draw a line. I really think that it's somewhere around the third trimester, when the fetus/baby is pretty much fully developed and could survive outside the womb.
And having had kids, I can say that there's another threshold after that. The baby becomes a person somewhere around 6-9 months after birth, when you can actually interact with the creature. Before that, it's an eating, peeing, and pooping machine that makes a ton of unpleasant noise, but there's nobody home. After that, you can see a real person in there and actually get some acknowledgement out of them that you exist.
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