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The only stem cell products the FDA has approved for use are stem cells extracted from umbilical cord blood, and then only for rare blood disorders.

The combination approach centers on mesenchymal stromal cells, which are found in various tissues in the body, including bone marrow, fat tissue and umbilical cord blood.

Both procedures allow for umbilical cord blood to reach the infant's body before clamping, reducing the risk of anemia and other complications seen among infants receiving immediate cord clamping and cutting.

The first, a 2019 study, tested umbilical cord blood for traces of acetaminophen and the second, published in 2020, measured acetaminophen in babies' first bowel movement.

The hospital said the trial saw her receive "a cord blood stem cell transplant" alongside a series of white blood cell transfusions, which were aimed at "boosting the cancer-fighting abilities of the new cord blood".