When a child arrives, parents have one brief opportunity to collect stem cells...

https://emedicodiary.com/post/2217/from-birth-to-bedside-how-umbilical-cord-stem-cells-are-changing-modern-medicine

When a child arrives, parents have one brief opportunity to collect stem cells from the umbilical cord. Cord blood provides hematopoietic stem cells (HSCs) for treating various blood disorders