Answer: Primary Circular Reactions
Explanation:
Primary Circular Reactions is the sensorimotor stage of Piaget's theory for cognitive child development. This stage usually occurs in children from 1 month old to 4 month old . New schemas are introduced by baby which he/she tends to repeat.
These schemas are drawn due to the sensation present in body of the child and they repeat the act that occurred accidentally because it makes happy and pleasurable. E.g.-child sucking thumb because it makes him/her feel happy.