Let's clear something up here. Being born with sin is just that. We have to grow up and mature before we can show who we really are anyway whether good or bad.
A baby is innocent. That means it doesn't KNOW anything. That doesn't mean it's good. When a baby grows it learns about life. A child is innocent and pure because of it's lack of experience.
We must teach them right from wrong because they don't need to learn how to lie, or accuse siblings of things they really did.
That being said, they are precious. They are innocent and we need to respect that as long as possible to preserve their innocence. Because as we all know, The eye doesn't tire of seeing junk... p 0 r n o g r a p h y, etc.