The squatting position, in addition to allowing the infant to receive the placental blood from above, . . . avoids compression of the blood vessels supplying the placenta, which occurs in the supine patient when the gravid [pregnant] uterus tilts back against the pelvis.
( ちなみ に 年代 の 錯簡 は 後者 の 方 が少な い と 考え られ て い る )jw2019 jw2019