Thomas Aquinas, Compendium of Theology

For the same reason that God, in restoring the risen body, does not reclaim all the material elements once possessed by man's body, He will supply whatever is wanting to the proper amount of matter. Nature itself has such power. In infancy we do not as yet possess our full quantity; but by assimilating food and drink we receive enough matter from outside sources to round out our perfect quantity; nor on this account does a man cease to be the same individual he was before. Surely, then, divine power can do the same thing much more easily, so that those who do not have sufficient quantity may be supplied from outside matter with whatever was lacking to them in this life as regards integrity of natural members or suitable size. Consequently, although some may have lacked certain of their members during this life, or may not have attained to perfect size, the amount of quantity possessed at the moment of death makes no difference; at the resurrection they will receive, through God's power, the due complement of members and quantity.