Identifying Piaget's First Stage of Cognitive Development

In the field of developmental psychology, cognitive development is a crucial aspect that helps to explain how children think and learn. One of the key theorists associated with cognitive development is Jean Piaget, who proposed a series of stages that children go through as they mature. According to Piaget, which of the following stages occurs first and involves a focus on the senses and motor skills, typically from birth to about 2 years of age?