Struggling to think of any reason you would want to store umbilical cord blood for your own child? Accidental exposure to a myeloablative dose of irradiation? Donating umbilical cord blood for others to use however is a very good idea.
Damage to an organ that requires transplant but not urgently? Better to have your own dna than someone else’s and have to take immunosuppressants forever.
Struggling to think of any reason you would want to store umbilical cord blood for your own child? Accidental exposure to a myeloablative dose of irradiation? Donating umbilical cord blood for others to use however is a very good idea.