There are many different stages of development that a child goes through. It also means that they have to be treated accordingly to that development stage. Many theories have been made based on a specific age group. The Piaget Theory of Cognitive Development is one of those theories. It describes children through the steps of a child development. The Piaget’s Theory of Cognitive Development. Jean Piaget (1896-1980) was a Swiss psychologist who worked with child development. Piaget’s theory states the process of how the child makes sense of the world and how it changes as they move through the stages. There are four stages to the Piaget’s Theory of Cognitive Development. The four stages are sensorimotor, preoperational, concrete operational, and formal operational stage. The sensorimotor stage is the first stage of the four stages. The first stage divides into 6 substages. The first substage is the reflexive stage (0-1 month). During the reflexive stage, they start to do reflexive activities such as sucking and grasping. The second substage is the primary circular reactions (1-4 months). They start to open and close fingers and they also start to suck their fingers. Repetition is also started in this stage. The third substage is the secondary circular reaction (4-8 months). In this stage, they repeat actions like kicking their feet. The fourth stage is the coordination of secondary circular reactions (8-12 months). Schemes are being made to get what they want. The fifth substage is the tertiary circular stage (12-18 months). In this stage, they start playing with toy with fitting shapes into where they belong. It is a trial error stage. The sixth substage is the symbolic thought (18-24 months). The last stage is the problem solving. They form mental representations of objects and its a transitional to the preoperational stage. The preoperational stage is the second stage of the Piaget’s Theory of Cognitive Development. It occurs during the ages of 2-7 years old. Language is developed during this stage. During the stage, children cannot see things or situation from different viewpoints. Piaget called this egocentrism. They become more curious and start to ask questions about everything. The third stage is the concrete operations. This stage lasts from 7-11 years old and is considered the turning point of a child’s cognitive development. It is during the middle childhood and logical thoughts are developed. They apply the logic to the physical objects, but no as abstract ideas. An important development during concrete operational is the development of conservation. Conservation means that changes in the quality doesn’t mean changes in the quantity. The last stage is the formal operational. This stage is age 11 till adulthood. In this stage, they start to think in an abstract manner. They are able to think creatively and do mathematical calculations. It is important to have knowledge about the Piaget’s Theory of Cognitive Development as a parent. It relieves pressure on the child and parent. The parent may think their child is developing slower than other child. The parents won’t pressure their kids to walk at an earlier age. Each child develops differently. They might think automatically that their child is sick or blame themselves if their child is not developing the same as other kids the same age. This theory can help parents see if their child is on track or that if their child is farther behind that they can seek help.