He knew you before you were formed in your mother’s womb.
He sanctified and ordained you to be a prophet un to nations. Jeremiah 1:5
So the moment you get to distinguish between good and evil, your journey with God begins.
If you ‘ve come to know God as your lord and saviour, please proclaim the same message of the Cross to your children and give them chance to confess him if they do accept the precious words of God. The good work of God in their lives has to start from their childhood.