Additionally, Black Widow also has a healing factor much like Wolverine. However, this ability comes with one drawback: sterilization. The Black Widow program prevents it’s ‘participants’ from having children due to their bodies rejecting the fetuses.
However, the Marvel Cinematic Universe suggests that a sterilization procedure occurs upon graduation from the program to ensure that the girls will be invulnerable to emotional attachments (in this case, a child.) While not addressed in the MCU, Black Widow actually has a lot in common with the Winter Soldier. The success of Bucky Barnes’ brainwashing and biotechnological enhancements paved the way for Black Widow Ops.
Bucky’s memories of Steve Rogers were wiped clean, causing him to murder Tony Stark’s parents and nearly take out Captain America, as well; but Bucky isn’t the only one who was a victim of memory manipulation.