[saturnfire16]

In order to be responsible for sin, one must have knowledge that the action is a sin and the physical and emotional capability to stop themselves from doing that if they choose. A two year old.... just doesn't. As they get older, they will at times, but it's not our job to judge their hearts. In other words, my response is going to be the same whether my child "willfully disobeyed" or made a childish mistake, because no matter how strongly the evidence points one way or the other, I'm not God. I cannot accurately judge my child's heart and it's not productive to our relationship or their relationship with God for me to try.

So, either way my response is "this is what we DO do and this is why." When they understand what TO do, and are immersed in loving relationships and come to understand God's love through that, anything less that that love (sin) will not feel right to them.