This seems to be exactly backward. You want to use an increase in gravity to facilitate childbirth, not a reduction!
Fortunately, there is the Blonsky Device:
https://dublin.sciencegallery.com/failbetter/apparatusfacilitatingbirthchildcentrifugalforce/

It's funny now to think of traveling without a car, but I recall an opening scene from one of the William Powell/Myrna Loy "Thin Man" movies in which the family arrives at a hotel in New York. They travel by train from one city to another, and then go by taxi to the hotel, with their luggage, etc handled by porters along the way.

I weigh . . . a lot more than I should. I really could use to lose 50 pounds.
Maybe a bit more exercise?
Now, I learn that I would need to walk across Antarctica while dragging a bunch of supplies, for three months, to lose 50 pounds!
Maybe I'll just give up!

This is much nicer than the Hellman's Aspic Aquarium.

. . . and if things get REALLY rough, they expel their intestines to disgust their enemies.

Here is the Wonky Donkey Song!
https://www.youtube.com/watch?v=SDeQT9zCvi4

Sometimes, it's best that we not know certain things until they are well over.

Many flying insects are oriented by sunlight or moonlight. They consider strong light sources to be "up". Since the top bucket projects into the clear middle bucket, mosquitoes will attempt to fly 'up' toward the light, missing the opening in the top bucket, which is lower than the top of the clear bucket.

It's a nice system. I'll have to try setting it up. It does not catch mosquitoes that have not yet fed off of you, but it will crash the local population, as the females are trapped, and the newly-emerging mosquitoes from the eggs are also pretty well trapped (or simply removed in the egg stage)

The opposite is the album: "Well I Should Have...Learned How to Play Piano", by 20-year comedy veteran Jon Benjamin. NPR called him "Full of real, untapped un-talent".
The recording session clip is at 1:38.

He invented MIDI!

I'd imagine that another reason it was more common was that houses weren't tied to a bunch of utilities, as they are now. Some may have had no interior plumbing or electricity, for instance.

I had read that, in the century after Columbus, 90 percent of the native humans in North America had died of disease. When we think of familiar 'native American' cultures, we are thinking of a remnant that was recovering from a catastrophe on the order of "The Stand".

In some of those fish species, at least, paternal child rearing might allow females to more quickly recover the caloric investment of making eggs, and mate more often.