"When Elizabeth heard Mary's greeting, the baby leaped in her womb..." Luke 1:41
"and he will be filled with the Holy Spirit even from birth." (Luke 1:15)
"Do you hear what these children are saying?" they asked him. "Yes," replied Jesus, "have you never read, "`From the lips of children and infants You have ordained praise'?"(Mat. 21:16)
The Bible and Christ Himself would seem to contradict you here, wouldn't they? (more evidence against abortion, by the way...)
I beg to differ. You say that "babies have no idea who God is" because you base it on your concept of knowledge. Do you agree that the only way that you or I "know" God is by His grace and not of our own doing? Assuming that you do agree, can you still argue that a baby is incapable of receiving the same? It is a mistake to determine what can and can't be based on limited human understanding. It is perfectly natural for a believer to realize that baptism of an infant is as valid as any other baptism. It is God's baptism and is not restricted by any rules or arbitrary ages we decide upon.