What is the effect of reduced gravity on human height?
As far as I am aware, no one has ever been born in space, so your answer cannot be answered directly. However, it is known that the absence of gravity results in an increase in body height by a few centimeters. This is due to stretching of the vertebral column, which is no longer being pressed together by the downward pull of gravity1. For example, the astronaut Richard Hieb, who spent 2 weeks in space, found that his height had increased by 1 inch (~2.5 centimeters)2. Loss of gravity also causes the blood and other fluids to migrate from the legs to the upper part of the body, resulting in swelling of the face and protrusion of the veins of the neck1. I assume that these effects reported at zero gravity at least partially apply to 10% gravity.

Sources
- Airbus Defence &amp; Space
- NASA