I am delighted to hear you don't believe in infant baptism but saddened to hear you think babies are born sinful. Yes parents must teach their children right from wrong but to commit a sin you must understand it is a sin and still do it. It is my understanding that doctors say childrens brains are not able to function in this way until they reach early teens.
May I just share an interesting bit of Egyptian psychology with you. My father in law arranged most of the work on my new apartment and I was delighted to see the name of G-d in Arabic carved into the front door. He explained to me that if anyone (Christian or Muslim) decided to break into my home to commit a crime they must first look at the name Allah. This will remind them of G-d and that what they are about to do is a sin in G-d's eyes. So if they still break in they know they are committing a sin rather than just a crime. I think that is so clever and my thanks to G-d the crime rate against homes and people in their homes in our town is virtually zero.
Thank you for the nice story.
The point I make in saying that none are without sin is that God did not create man with the propensity to sin.. as we see in babies.. this is a result of our sin nature after the first sin was committed. Sin is disobedience to God and babies are not accountable because they do not know right from wrong.. but they still have a carnal nature that will die eventually.
May I ask where do you live?