I have a spider plant baby that was recently cut from it's mother plant and potted in appropriate potting soil very carefully. It had roots, although small ones, when it was cut. It's a fair size. To my knowledge it is getting the right amount of sunlight and water. But it is deathly pale. Almost white. It seems completely normal and healthy, no dead or dying leaves, but it is so so pale. It was a normal colour when it was cut, and the other babies are normal colours as well. It's not supposed to be variegated, but it definitely shouldn't be this colour either. What's wrong with it? Pictures are the baby, and the baby compared to its mother. Baby is paler in real life, the pictures can't capture just how pale it is.

I suggest you take it out of the soil and inspect the condition of the roots to make sure they have not rotted or withered. If they still look okay, then try rooting it in plain water before transferring it to the soil. I assume you have it in a moderately sunny location and your water is not unusually hard or artificially softened.