It has been used for the baby themselves & siblings :)
Some cases where babies use them themselves: https://www.nature.com/articles/bmt2012146
https://pediatrics.duke.edu/news/umbilical-cord-blood-improv...
Some cases where babies use them themselves: https://www.nature.com/articles/bmt2012146
https://pediatrics.duke.edu/news/umbilical-cord-blood-improv...