I'm looking for a short story I read, probably online, within the last three years.
It is set on Earth in the near future. The main character is a young woman who becomes pregnant, but for some reason, over a certain period babies were born in the shape of spheres, or cubes, tetrahedra etc, instead of being, well... baby-shaped. The main character gave birth to a cube. I recall that cubic babies were particularly favored by nurseries and creches, as they could simply be placed on a shelf without causing problems, whereas the spherical babies would roll and bounce, and had a destructive side to them.
Eventually the phenomenon ended and normal babies were born again, leaving this strange cohort of geometrical children. The story followed the woman as she and her baby grew up, but I don't remember how the story ended (this is the main reason why I want to find it again!). I do remember that the cubic baby caused a rift between the main character and her mother. The mother had been putting pressure on her daughter to have a child, saying that her fertile years were running out and so on, but when the cubic child was born she completely rejected it and cut off contact with them.