Behold, I was shapen in iniquity, and in sin did my mother conceive me. --Psalms 51:5
This, however, doesn't state that you were born sinful unless you've already assumed a few things that are as yet undemonstrated. To counter this, there is what Jesus said about children and sin:
"But if anyone causes one of these little ones who believe in me to sin, it would be better for him to have a large millstone hung around his neck and to be drowned in the depths of the sea. Woe to the world because of the things that cause people to sin! Such things must come, but woe to the man through whom they come!"
--Matthew 18:6&7
Hey, I have an idea. Let's quote from poetry and make it mean something LITERAL. Nice.