I believe the doctrine of original sin is man made like the doctrine of spanking is man made.
God created children to go through each developmental stage. Babies cry to communicate. Toddlers test boundaries and lack impulse control. Young children do not set out to sin until they are older.
God does not call children sinners. The way we view children is how they will behave. Many Christians seem to view children as “sinners” and “manipulative.” That’s Dobson’s view too as he calls them horrible degrading names in his books. This sets up an adversarial parent-child relationship.
Interestingly, God calls children blessings in Psalm 127:3. I view children as little people in need of help, guidance, and discipline (teaching).
When the focus is on cooperation instead of control, children cooperate. Children do better when we view them as God does. Young children are not capable of truly understanding sin. They even have a special knowledge of Who God is according to Matthew 25:11.
I do believe Jesus cried as a baby and screamed as a toddler because these are developmental behaviors. James 4:17 states, “Therefore, to one who knows the right thing to do and does not do it, to him it is sin.” This can only apply to older children and adults who truly understand sin. “Moreover, your little ones who you said would become a prey, and your sons, who this day have no knowledge of good or evil, shall enter there, and I will give it to them and they shall possess it” (Deuteronomy 1:39).
God clearly says young children do not know right from wrong. It’s up to us to gently teach and guide them through each developmental stage.