And if a presumably sentient creature is aborted before it attains sentience, has it suffered?
It has to be, otherwise the abortion debate would be very different. Aborting a somewhat conscious fetus would be much closer to murder.
Re: bad for the creature, hyenas give birth through their clitoris. I'd suggest that's not great. Children cost an average of $233,000 to raise. That's certainly not great. That doesn't take into account career cost and opportunity cost of lost income. Sub-optimal too.
I'd describe children as mandatory lol.