Did you post on the wrong thread,Stewball This is about food, not churching.
The mikveh - that is every month, not just after childbirth! Perhaps no harm done, as you say, but she is considered unclean, and untouchable to men (including her husband, of course, and I do mean "touch", not just intimate touching) for a week after her period has stopped. So no cuddles, no affectionate pats, and for the very pious, not even sharing a bed.
Read "The Marrying of Chani Faufman" where the rabbi's wife has a miscarriage and he is so bound by the "no-touch menstruation" rules that he is hesitant to touch her to help staunch the flow of blood. He is also anxious that her own hair is not seen by other men and that it is covered before the stretcher takes her out to the ambulance.
Superstitions about the evil powers of women and keeping their attractions completely hidden from all but one man.