Halakhah for Niddah 5:10

Moreover, Rav Shmuel Wosner (Teshuvot Sheivet Halevi 2:205 and 6:175) adds that the Mishnah (Niddah 5:3) describes how a baby on the day it is born has the potential to become tamei. This clearly indicates that before the baby is born it does not have this potential. Rav Wosner seems to share Rav Zalman Nechemia’s view that the prohibition for a kohen to come in contact with the dead applies only in a situation where the kohen becomes tamei. Indeed, he writes that a wife of a kohen should not hesitate to give birth in a hospital despite the presence of tum’at meit. It seems that Rav Wosner would not require a kohen’s wife to inquire as to the gender of her child when she undergoes a sonogram and that he would permit a kohen’s wife to visit a hospital or funeral home even when she is pregnant.