Interspecies pregnancy occurs when at least one parent, either male or female, possesses the hyperseeder trait. How this trait manifests itself during fertilization and the pregnancy depends on which of the parent posses the hyperseeder trait. Finally, at the end of term, when the mother's body is infused with enough xeno RNA to be self sufficient and completely safe environment for the alien offspring, the milk glands in her breasts begin to create genetically compatible milk for the soon to be born offspring.