Disagree if you want, but it is clear to me that there are exceptions. To find personal sin in the day old infant is ridiculous.
What there is in the one day old infant ... is a bent to sin, particularly through selfishness.
Given enough time, that child will sin.
I find nothing, as I have stated. I trust that God's Word is true. It is you that 'finds' innocence in youth, within the confines of your own knowledge, and of your own judgment, making exceptions where none exist, and gainsaying the clear word of Scripture. That is a caution.
You are welcome to prove your point upon the Word, at which time I will happily cede my position. But until I see it in the Holy Texts, I can do nothing other than stand firm.