Nice As It Sounds, Not All In This World Are Children of God

"I baptize you in the name of the Father,

the Son, and the Holy Spirit."

We have a new baby in our family and she will be baptized soon.  She will become a child of God.  Through the Sacrament using water and words she will be reborn and her name will be forever recorded in heaven as a redeemed member of the human race through the death and resurrection of Jesus Christ. 

Just as no infant can ever re-enter the womb of its mother and be born again into this world, no infant or child or adult can ever be re-baptized or reborn of water.  Once is enough for all eternity in both cases.