The first stage of cognitive development that Piaget states is the sensorimotor stage. This stage is initiated at birth and lasts normally through when the child is 18 months. Everything in this stage is learned from the child exploring different things the best way they know how, whether by putting things in their mouth, or learning how to make the toys move on their play mat. Also, early language development occurs during the early part of this stage such as “coo-ing”. Then language progresses into words towards the later part of this stage where the child starts forming actual words such as “No”, and “Mine”.
The second stage of cognitive development is the preoperational stage. This stage starts around 18 months, and lasts until about the age of 7. Children start being able to grasp symbols. For example, they can draw a series of squares with a triangle on top to represent a house. They also start to learn the alphabet, which is, of course, the set of symbols we use to read and write. On the other hand, they don’t understand abstract concepts like amounts, speed, or weight. In one of Piaget’s most famous experiments, he showed that children at this stage can’t comprehend that if you pour liquid from a short, wide glass into a tall, narrow glass, it’s still the same amount.
The third stage of cognitive development is the concrete operational stage. This stage starts around 7, and lasts until 12 years old. In this stage