Quite literally that may have been the case, but this is not our usual way of reckoning life. Birth is the defining moment of our lives. Baptism is the visible expression of an invisible process by which God uses his message to touch our hearts and call us by faith into his family. Birth does not create life. It simply brings forth the life that was previously conceived.
Birth completes the process that began at conception.
Baptism does not create life, but simply finishes the process begun by the Spirit when one came to faith. Yet to all who received him, to those who believed in his name, he gave the right to become children of God-children born not of natural descent, nor of human decision or a husband's will, but born of God. As long as the child remains in the womb, that viability-the ability of that life to survive will remain in question. There are too many things that can happen that are detrimental-even fatal to life between conception and birth, and so there is always a tension and sense of anxiety as the time of delivery approaches. They believe for awhile, but in the time of testing they fall away.