"Rights" are established by our moral compass, be it individually or collectively as in a society. The "Alpha moment" is established by agreement.

I would say when the nervous system has developed enough for the baby/fetus to in theory experience thought and feelings and hurt etc.
Just because a fetus is reliant on the mother who is carrying "it" doesn't mean it isn't human - no different to someone on a life support machine really.

Also just because people don't remember being in the womb, it doesn't mean they aren't thinking and experiencing things. They wake/sleep, react to noise, and there is a very good chance (though not one we can prove) that they are engaged in pretty rational thought.

When does a person aquire rights? Well that's convention according to the society they're in. Many societies still execute people, some backward societies may abort right up to almost the moment of birth.

When does something become "human" - surely that should be conception because those clusters of cells aren't horse or do we mean when does a fetus become worthy of rights - well I'd say that should be at the moment of rational thought/awareness. So you think it's birth, I think it's probably earlier. The current abortion limit of 24weeks is then possibly not a bad indicator. Definately don't want to turn this debate into the wrongs/rights of abortion. Or could that be the idea? Suppose it's linked to the question really - it has to be for anyone to decide at what point in the cycle of pregnancy abortion is definately morally wrong

Hmmmm ok. So the procedure is killing a nearly ready for birth baby/fetus. Not sure what to think of that really, it doesn't seem right in so many ways but I'm not the expert.