Randy Alcorn quotes Wayne Grudem's Systematic Theology where he makes the case that Stephen didn't just see an image of Jesus as he was being martyred, but actually saw Jesus in His physically resurrected body. This video clip was excerpted from Randy's Eternity 101 DVD class.

Your question about what the resurrection body of an infant might look like, is one that the Bible is not quite specific on. Much caution should be exercised as we try to discern an answer that is compatible with God’s revealed truth. I believe we can come to a position that is satisfying and does not contradict Scripture.