Most stories that involve abuse have them born and then immediately killed because they have no accessories. The ones that are love oriented... well, you can guess.
i wonder... if it's born without it's accessory would it know that it suppose to had accessory and demand it? that is if it's doesn't ever met another yukkuri with accessory of course
Yukkuris inherit the memories and instincts from their parents... so yes they would know what sort of yukkuri they are. They are born with full "yukkuri-knowledge" if you want to put it that way.