The Planes of Development

Montessori Thrive

Maria Montessori based her entire educational philosophy on the idea that children developed through a series of four planes. Each of these planes is easy to recognize and has clear, defining characteristics. If we study and understand these stages, we can approach our interactions with children with a new perspective. 

Learning about the planes of development isn’t just for Montessori educators. Understanding your child’s development can help at home, too. 


The First Plane: birth-6 years


During this stage children absorb everything like sponges. They are, indeed, excellent examples if what Montessori called ‘The Absorbent Mind.’ This is a time in which we are able to utilize what Montessori called sensitive periods of learning. While each child is different, there are typical patterns that emerge in regards to brain development and general readiness to learn particular skills.


During the first three years of this plane, all learning is done outside of the child’s conscious mind. They learn by exploring their senses and interacting with their environment. During the second half of the plane, from about 3-6 years, children enter the conscious stage of learning. They learn by using their hands, and specialized materials in the Montessori classroom were developed with this consideration.


During this time, children have a wonderful sense of order. They are methodical and can appreciate the many steps involved in practical life lessons in their classrooms. The organization of the works on their classroom shelves is intentional, which appeals again to this sense of order.


The first plane is a time in which children proclaim, “I can do it myself”; it is a time of physical independence.


The Second Plane: 6-12 years


During the elementary years children begin to look outside themselves. They suddenly develop a strong desire to form peer groups. Previously, during the first plane, a child would be content to focus on their own work while sitting near others. In the second plane, a child is compelled to actually work with their friends. It is during this time that children are ready to learn about collaboration.


During the second plane there is a sudden and marked period of physical growth. This may be a contributing factor to the observation that many children of this age seem to lack an awareness of their body, often bumping into things and knocking things over. Children begin to lose their teeth around this time as well. Their sense of order and neatness tend to fade a bit during this plane.


Throughout the second plane, children’s imaginations are ignited. Since Montessori education is based in reality, we find ways to deliver real information to children through storytelling and other similar methods. For example, when teaching children about the beginnings of our universe, Montessori schools use what is called a Great Lesson. The first Great Lesson is a dramatic story, told to children with the use of props, experiments, and dramatics (think: a black balloon filled with glitter is popped to illustrate the Big Bang, with bits of paper in a dish of water used while talking about particles gathering together). This lesson is fascinating for children in the way it is presented, but gives them basic information about the solar system, states of matter, and other important concepts.


Children in the second plane have a voracious appetite for information, and are often drawn strongly to what we in Montessori call the cultural subjects: science, history, and geography. While we support their rapid language and mathematical growth during this time, we are also responsible for providing them with a variety of rich cultural lessons and experiences.


It is important to note that children develop a sense of moral justice at this time. They are very concerned with what is fair, and creating the rules to a new game is often as important (if not more so) than playing the actual game itself.


This is the period of time in which children are striving for intellectual independence.


The Third Plane: 12-18


The third plane of development encompasses the adolescent years. During the second plane, children become aware of social connections, but in the third plane they are critical. During this time children rely heavily on their relationships with their peers. They feel a strong desire to remain independent from adults, although they are not quite ready to do this entirely. It is our job to find ways that allow them to experiment with independence while also providing a safe structure in which they may do so.


Children in the third plane tend to require more sleep, and they sleep later than when they were younger. They long for authentic learning experiences, and Dr. Montessori imagined just that. Her ideas of Erdkinder (children of the earth) led her to contemplate a school setting that would support children’s development during this time. She imagined a farm school, in which children would work to keep the farm operational, but also contribute to planning and decision making while doing so. 


During the third plane children are refining their moral compass while developing a stronger sense of responsibility.


The Fourth Plane: 18-24



The final plane is a time in which young adults are striving for financial independence. They are often living away from home for the first time, and use this time to figure out where they fit into their society. Many make choices to further their education and/or explore career paths.


It is during the fourth plane that people begin to develop a truer sense of who they are as individuals.


Each plane of development should be mindfully nurtured. If a child is able to experience one developmental phase in a rich and carefully prepared environment, they are ready to fully take on the next phase when it is time.

By Ms. Jessica March 3, 2026
Toilet learning is an important milestone in early childhood, and in Montessori education, it is approached with respect, patience, and trust in the child. Rather than something adults train, toilet learning is seen as a natural developmental process that unfolds when a child is ready. Following the Child Children develop at their own pace. From a Montessori perspective, readiness is more important than age. You may notice signs such as staying dry for longer periods, showing interest in the bathroom, communicating bodily needs, or wanting to participate in dressing themselves. When we wait for these cues, children feel respected and capable—two key foundations for independence. Being able to feel the wetness from cloth diapers or underwear helps with body awareness. A Prepared Environment at Home and School Independence grows when children can do things for themselves. Simple environmental supports make a big difference: A child-sized toilet or potty A step stool for the toilet and sink Easy-to-remove clothing A place for clean clothes within the child’s reach When the environment is prepared, children can manage each step with confidence, building pride in their abilities. Respectful Language and Calm Support The way we talk about toilet learning matters. In Montessori, adults use calm, neutral language that helps children tune into their own bodies: “Your body is telling you it’s time to try.” “Accidents happen while we are learning.” “You have wet clothes, lets go change” There is no pressure, punishment, or reward. This allows children to focus on internal awareness rather than external approval. Toilet learning is just like other learning only it involves bodily functions. Accidents Are Part of Learning Accidents are a normal and expected part of the process. When handled calmly—“Your clothes are wet. Let’s change them”—children learn without shame. These moments provide valuable information and help children make connections for next time. Consistency and Patience Offering regular opportunities to use the toilet, such as after waking or before going outside, supports learning while still honoring the child’s choice. Progress may move forward and backward, especially during times of change. This is developmentally normal and met with reassurance and patience. Independence Is the Goal From a Montessori perspective, the goal of toilet learning is not speed or perfection, but independence. Each step a child takes toward caring for their own body strengthens confidence and self-trust. Home–School Partnership Toilet learning is most successful when home and school work together. Open communication allows us to support your child consistently and respectfully across environments. Sharing observations about your child’s readiness, routines, and any changes at home helps us respond thoughtfully at school. Likewise, we will keep families informed about progress and experiences in the classroom. When children experience the same calm, supportive approach in both settings, they feel secure and confident as they build independence.  By working together and honoring each child’s unique timeline, we can make toilet learning a positive and empowering experience—for both children and adults.
By Ms. Kim February 17, 2026
At its heart, Let Grow is about giving children appropriate freedom and responsibility so they can grow into capable, resilient individuals.