
The foetus (baby in the uterus of the pregnant mother) 1-3 weeks prior to delivery date (so long remaining in upright position) turns upside down, and the uterus descends down in such a way that the head of the foetus remains fixed in the pelvic floor of the mother. 1-3 weeks later, at the delivery time the mouth of the uterus dilates and the child comes out. Even after...