The former is also called yomogi no ya (mugwort arrow) and the latter is kuwa no yumi (mulberry bow), and yomogi no ya was shot in four directions of the house by kuwa no yumi in order to be rid of future disaster when a boy was born.
それぞれ、蓬の矢（よもぎのや）・桑の弓（くわのゆみ）とも言い、男の子が生まれた時に前途の厄を払うため、家の四方に向かって桑の弓で蓬の矢を射た。