Everywhere are rules of pregnancy which bind both the woman and her husband. During pregnancy neither of them is permitted to eat the flesh of any animal which was itself pregnant at the time of its slaughter. Even of the flesh of a non-pregnant animal there are certain parts--the heart, liver, and entrails--which may not be eaten by them. It is claimed that to eat of such food at such a time would make a great deal of trouble for the unborn infant. During his wife's pregnancy a man may not cut the throat of any animal nor assist in the butchering of it. A carpenter whose wife is pregnant must not drive a nail. To do so would close the womb and cause a difficult labor. He may do all other work belonging to carpentering, but he must have an assistant to drive the nails.In the burial of a first-born infant the lid of the coffin is not only not allowed to be nailed down, but it must not entirely cover the corpse; a space must be left open (generally above the child's head); the superstition being that if the coffin be closed, the mother will bear no more children.