Jesus promised a resurrection for all in John 5:28, 29. "…all in the graves will hear His voice and will come forth." Those who die as infants will come forth come forth as infants recognizable to their parents. This resurrection to life on earth in Christ's peaceable kingdom is what Jesus taught us to pray for, "Thy kingdom come, thy will be done on earth…" Matthew 6:10.
Jesus loved the little children and they loved him. They saw his kindness and He noted their trust and openness to his teaching. Jesus wanted his followers to "…become as little children…," Matthew 18:3. So, it is reasonable to expect that in the earthly resurrection, children will be especially cared for by their loving parents.
Isaiah describes conditions of the new way people will walk where nothing will hurt them. "The wolf and the lamb shall feed together…They shall not hurt nor destroy in all my holy mountain…" Isaiah 65:25. We imagine the resurrection process might happen this way: Those who are following Christ will want to be with their beloved children who are in the grave. They will pray for their resurrection and will prepare a loving environment for them so that they can teach them about Christ in his righteous kingdom. Parents and loved ones will nurture children to a mature understanding of who God is, who Jesus is, and how to follow Jesus in his beautiful new kingdom. This process will lead to the final condition of mankind on earth described in Isaiah 11:9, "…the earth shall be full of the knowledge of the LORD, as the waters cover the sea."
One additional note: Jesus on the cross provided for his mother's care as he told the apostle John, "Behold your mother," John 19:27. The principles of Christ's kingdom on earth will be that all who are resurrected will be brought into a loving, safe, just environment. What a beautiful future prospect!