"The second parent may not have given birth but they are (or should be) equally responsible for the upbringing of new life. And that should be from the start."
But the second parent is not in need of any medical care.
They are not ill, not vulnerable, not being medically examined, not bleeding, not breast feeding, not recovering from a major operation, not receiving blood to make up for what was lost during birth, not doing anything that any of the woman who are there as patients who have just given birth are doing or having anything done to them that is being done to those same women.
They can be equally responsible for the upbringing of a new life without taking up space in a hospital ward where their very presence might be making other patients feel stressed, scared, embarrassed, intimidated, uncomfortable or as though they have to leave before they are well enough.
If women leave the hospital early because they can't cope without help from their partner, that's a disgrace likely caused by an issue of under-staffing in the hospital, and we should all be campaigning for better care and more midwives, for the sake of all mothers and babies.
But that's a very different issue than a woman leaving hospital because she's frightened of another patient's visitors and feels she can't stay overnight in a ward full of strange men, many of whom are not going to be nice helpful men sitting quietly in chairs.
Instead they are men who have shouted at women in labour, abused staff, peered around curtains, watched breastfeeding strangers, made a nuisance of themselves and frightened and upset women they don't even know.
That's a bigger disgrace, because no patient should be so intimidated by someone else's visitors that they feel forced to leave when they still need medical care.