First, you’re going from one extreme (women are delicate flowers) to the other extreme (a birth is just small stuff, you can go home the same day). Thus you have excluded the reasonable middle:
a birth is a major procedure, even if natural, and takes time to heal and recover from.
In my country (Germany, in the Socialist state of Europe) we have maternal protection athe workplace
This is medically sensible not because women are delicate - medical science knows that complete bedrest during pregnancy like in Victorian times is usually not healthy. Nevertheless, esp. in the last weeks, pregnancy is not a stroll in the park either - not only is the mother carrying a lot of weight with the baby, her whole organism is supporting it, which is an additional strain, plus the hormones are making her own body go out of whack. So it’s different from a man being overweight or carrying a bag of potatoes for an afternoon to see what it feels like.
Time off for sickness is of course in a civilised first-world country always given as needed. That some employees have a limited amount of days off per year, both for vacation and sick leave, strikes me as unlogical and backwards and non-rational in the extreme: humans aren’t machines and can’t control how often they get sick, or why and how long.
So instead of shortening maternity leave, the sensible medical rational solution is to allow unlimited sick leave for all employees if really sick (together with Access to Healthcare to get treatment, instead of sitting around sick infecting everybody else, or being fired and a drain on the economy).
In addition to the medically reasonable maternity protection, there’sparental leave, which used to be taken by the mothers, but can now be taken by the father or split to suit individual circumstances. It’s both because new babies need feeding, and with all that waking up every 4 hrs., people can’t really work anyway; and babies needs bonding with their parents if we don’t want them to shrivel into soulless cold bastards who become penny-pinching employers.
The usual construction is that the mother takes off the first 6 months for breastfeeding, and when the child is 1 1/2 years old she starts working part time again. Or the father takes off when the child is about 1 year old to bond, too.
Protection laws for employees should never be optional, because in most cases the job market is against the employee.
Actually that sounds as if there is some maternal protection or leave in the US as law after all? Really? Than why do so many people say that they have to go home from hospital the day after birth? Why do so many women say they went to work while the baby was still keeping her up, because she couldn’t afford staying home? Is this unpaid leave in the law???
In the Pulitzer article on babies being forgotten in car seats and dying, one factor often cited that shocked me was on how much sleep deprivatin those parents still worked and drove cars - because the laws didn’t give them the first half year off paid.
So if you want to prevent deaths by accident from sleep deprivation and exhaustion, the care-taking parent needs to be able to stay at home for at least the first 6-9 months, until the baby lets the parent sleep the night through. There are tons of evidence on the negative effects of sleep deprivation.