The fact that we are all, since the Fall of our primordial ancestors, born into a contagiously sinful world, assures that we will eventually sin, becoming sinners. Jesus apparently did not feel the need to castigate babies and children--we have no record of that. What we do have is a record of Him loving them and blessing them. He greatly respected their innocence. Jesus, because He had the Holy Spirit "without measure" was able to maintain His innocence until death. How is it that He was not born dead in sin? Was He not human? Granted, He was fully God, but He was also fully man, according the the ancient doctrine of the Church.