Early Childhood Studies.
The study of the fundamentals of the first 12 years.
The child is developing their psychology and fundamental basics during these years. Each year a foundational understanding is being developed and that is the right timing for the child's psychological/mental/emotional development. If they miss that foundation stone they go to the next cycle without a solid base of the previous cycle they are on shaky ground. Each year impacts on the next so by the time they are 13 they are in a repeat cycle a chance to relearn the lost wisdom. But the habits already installed can become more ingrained and harder to change.
They are also developing their communication skills and if one can detect their learning style and use that to teach them. They will find learning easy.