Montessori sensitive periods can be defined as a period when a child's interests are focused on developing a particular skill or knowledge area.
According to Dr. Maria Montessori, there are six sensitive periods: order, language, walking, the social aspects of life, small objects, and learning through the senses. These are periods of psychological development in the child.
Each of these Sensitive periods takes place during the early childhood years, typically during the first six years of life.