Disclaimer: This is the one and only time I will say it I DON'T OWN NARUTO
It was another boring night being a guard at the Konoha gate. When an ominous mist started to roll in. The guards were just getting used to the strange occurrence when they say a small silhouette coming towards them. When the silhouette got close enough for them to see they found it was a child who couldn't be older than 2 years old, but what really scared the guards was that the child was covered in blood and his clothes torn in all places. Even weirder was that the child had a strange device attached to each wrist. Once the child was close enough for them to see that it was a boy he collapsed. Both guards run forward and flip the boy over on to his back but in doing so they moved the torn shirt revealing something on the boys stomach that chilled them both to the bone.
A jinchuuriki seal...of blood.