I have had a discussion with many Orthodox about the fate of children that die before being baptized.
Some told me : they are going to hell. Do you have any Patristic text saying this.
Another told me : :their soul go to the Empire of the North, where they are not in paradise because they cannot see God's face. He told me he read this in books published by Jordanville. It lokks like the catholic limbos
Finally, I think they go to paradise becaise they committed no personal sins. This was also the opinion of Saint Gregory of Nysse.
See