Jean Piaget
Why do babies repeat the action of sucking their fingers?
The child accidentally sucks his fingers and then intentionally repeats the action because it's pleasant to him to do it
Why is the sensoriomotor stage called that?
It's called like that because it's through the baby's senses combined with physical abilities that children can do different activities.
What age range are the children in the concrete operations stage?
7 years to 11 years