Sounds like this needs to be tested by the supreme court. An unborn kid can't each be a kid, a passenger, a foetus, inside the mother, and outside the mother at the same time.
Their ruling would probably be that the kids needs to be removed from the womb by the mother for the duration of the journey, whereupon it will be safely secured in a child seat in the second row, then placed back in the womb once the journey has come to an end.
Their ruling would probably be that the kids needs to be removed from the womb by the mother for the duration of the journey, whereupon it will be safely secured in a child seat in the second row, then placed back in the womb once the journey has come to an end.