This is not what the Orthodox believe and I don't believe I would have said it that way. We simply do not speculate, knowing that God is not limited in any way to save by His grace whomever He wishes.
Yes, that's why I used the word "technically". I know you believe God can do whatever He wants, whenever He wants. I just thought that absent a special dispensation by God, you thought that an unbaptized baby does not go to heaven.
Baptism, in Orthodoxy, is a petition for adoption of one's soul into Christ by the Holy Spirit. We concentrate on adoption, and trust that the adopting Parent will protect. That's all. We do not go into details of God's mind, or plans.
Adoption, by definition, does not require "understanding" or "age of reason." God's grace is not held hostage by our intellect or our acceptance of Him.