Mutations during pre- or post-implantation can cause developmental issues like stillbirth by stopping cell proliferation.

“So it could be pre-implantation or post-implantation. Um a mutation arises and somehow um the the genetic programs of embryology are somehow made aware that down the line this is going to lead to a a uh stillborn fetus or something. So, so uh I mean uh nature doesn't have a a conscious logic in the same way that we think but but the the the genetic decision therefore is to uh is to stop is essentially a stop cell proliferation and and the pregnancy is terminated.”