Stages of Development Series: Infancy
March 3, 2025

Imagine education from a fresh perspective—one that sees children not as empty vessels waiting to be filled but as whole individuals embarking on a lifelong journey of self-formation. From the moment of birth, children are driven by powerful internal forces that guide their growth and help them adapt to their unique time, place, and culture. This remarkable ability to evolve and adapt is a defining trait of our human species.


The Montessori approach to education is built upon this profound understanding of human development. Dr. Maria Montessori dedicated her life's work to observing how children grow and change over time, identifying key developmental stages that shape their path to maturity. Through her scientific observations, she identified four distinct planes of development, each with its own unique characteristics and needs.


In this four-part blog series, we’ll explore each of these four stages—birth to age six, six to twelve, twelve to eighteen, and eighteen to twenty-four—unpacking how Montessori education adapts to support children’s evolving needs at every phase of growth. By understanding these developmental stages, we can better support young people on their journey to becoming capable, independent, and fulfilled individuals.


Infancy (Birth to Age Six)


The first plane of development is an extraordinary period of psychological and physical growth. Newborns enter the world entirely dependent, unable to move or communicate. Yet, within just six years, they are walking, talking, and asserting their independence with intellect and will.


Characteristics of the First Six Years


During this transformative stage, children require ample sleep to support their rapid development. However, when they are awake, their curiosity knows no bounds. They explore their surroundings with boundless energy, using their senses to touch, smell, taste, hear, and examine everything in their environment.


Conquest of Independence


One of the primary goals during this stage is achieving functional independence. Children are eager to take care of their own needs and are naturally inclined to observe and imitate the actions of adults. The mantra of children at this stage is: “Help me do it myself!”


Sensitive Periods


Children in the first plane experience sensitive periods—windows of opportunity when they are uniquely receptive to acquiring essential skills.


Movement: Young children need movement to develop brain-body integration.


Order: They crave order to make sense of their surroundings, learning what happens and how objects are used.


Language Acquisition: This is a critical period for language development, during which children absorb words and speech patterns effortlessly.


These sensitivities drive children’s development, shaping their understanding of the world.


Observable Milestones


One of the most profound achievements in this phase is the acquisition of spoken language. Talking to newborns, for example, stimulates vocal cord development, and astonishingly, their vocal cords vibrate when adults speak to them. From being essentially mute at birth, toddlers can have a vocabulary of around 200 words by age two and an impressive 10,000 words by the end of this phase. This makes it essential to provide a language-rich environment during these formative years.


Physically, this period is one of monumental growth. Children progress from being immobile to sitting, crawling, walking, speaking, and independently eating. As adults, we must be mindful about supporting rather than hindering this development. We want to offer rather than limit growth opportunities for our children!


The Sub-Planes: Ages 0 to 3 and Ages 3 to 6


The first plane of development can be divided into two distinct sub-phases:


Ages 0 to 3: Children’s development is largely unconscious, driven by innate forces. During this phase, children absorb the world around them and do so without any filters. It’s important during this time that adults respect children’s natural developmental path without imposing external motivations.


Ages 3 to 6: During these years, children become more consciously aware of their actions and motivations. This is when we see the emergence of children’s willpower and the powerful drive to classify and understand their environment. Children become more conscious learners. 


As they grow, children naturally identify patterns, similarities, and differences based on their experiences. They construct their understanding of the world from scratch, and active experiences in their environment play a crucial role in shaping their cognitive development.


Social Development in the First Plane


During their first three years, children form strong bonds with their primary caregivers and family, finding comfort in a small social circle. They prefer solitary exploration and engage in parallel play.


By age three, children seek a broader social experience beyond the family. They require opportunities to interact with peers and engage in community life, which fosters independence and social development.


Creating a Supportive Environment


Providing the right environment is crucial to supporting children during their early years. Key elements of an optimal environment include:


A Secure Home: A safe and loving home helps children build trust and confidence in the world around them.


Freedom to Explore: Children need space and opportunities to move and explore safely, both indoors and outdoors.


Language Exposure: A rich linguistic environment helps children build vocabulary and develop confidence in self-expression.


Participation in Daily Life: Involvement in practical life activities helps children develop independence and a sense of belonging.


Cultural Experiences: Exposure to family traditions, rituals, and cultural practices helps children adapt to their culture and understand their place within it.


As children develop over the course of this stage of life, they also benefit from being part of a social community and, in the process, learn valuable lessons about cooperation, sharing, and responsibility.


By understanding the characteristics and needs of the first plane of development, we can create environments that nurture children’s natural growth, independence, and exploration. We invite you to visit our school to see for yourself how a prepared environment can meet the needs of our youngest children!


Montessori Materials Explained: The Fundamental Needs Charts
May 26, 2025
Through Fundamental Needs Charts, Montessori students discover how all people meet life’s essential needs, nurturing empathy and understanding.
Practical Life Has Purpose!
May 19, 2025
The Purposes of Practical Life in Montessori In a Montessori classroom, practical life activities play a foundational role in supporting children’s development, independence, and connection to their environment. Because children are actively absorbing and adapting to the world around them, everything we offer in practical life serves a developmental need. Supporting Independence One of the primary goals of practical life is to nurture children’s functional independence—the ability to care for oneself and the environment and interact meaningfully within a community. The first plane of development (0 to 6 years) is marked by a strong drive for independence, with children eager to do things for themselves. By the time a child enters the Children’s House (approximately ages 2.5 to 6), they have already made strides toward independence. However, they still require an environment that allows them to refine their skills. In the world, children generally encounter a number of obstacles to their independence: Household processes (e.g., cleaning dishes in the dishwasher) may be hidden or too complex. Tools are adult-sized and difficult for small hands to use. Movements happen too quickly for children to absorb (e.g., tying a shoe). The Montessori environment addresses these barriers by providing: Child-sized tools for daily activities, such as preparing food and caring for the classroom. A clear, ordered sequence of movements that children can observe and repeat. The freedom to practice skills at their own pace, allowing them to move from passive observers to active participants. Supporting the Sensitive Period for Movement We also recognize that young children are in a critical period for refining their control and coordination. So practical life activities are designed to help children refine their movements in purposeful ways, directing children’s attention and energy toward focused, intentional actions. Walking on the line of an ellipse develops balance and control. Pouring water from a basin to a bucket refines precision. Carrying a tray teaches careful, measured movements. One of the most challenging yet essential aspects of movement is control. It takes effort to stop pouring just before a cup overflows or use only a small drop of polish when shining an object. By engaging in these exercises, children strengthen their willpower and gradually master their own actions. Supporting the Sensitive Period for Order Children in the first plane of development have an innate need for external order, which is reflected in their surroundings and daily routines. Montessori environments support this in a variety of ways. We ensure that activities have a logical sequence of steps so as children learn new concepts, they can also rely on the sequencing. Materials are placed in a specific order on the shelves, moving left to right and top to bottom so children begin to internalize the same patterning we use for reading as they work through the easier and most concrete activities to the most challenging and abstract. Montessori activities are color-coded. For the youngest children this means that all of the items for something like window washing will have the same color which helps children keep the set together. As children get older the color-coding is designed to help them grasp concepts like place value in math or parts of speech in language. Once children internalize these structures, they gain confidence and independence, allowing them to complete tasks from start to finish without adult intervention. Assisting with Cultural Adaptation Practical life activities reflect real-world tasks that children observe in their daily lives. Children are naturally drawn to meaningful work—they want to help, imitate, and participate. For example, in Dr. Montessori’s early observations in San Lorenzo, she saw that children were fascinated by the gardener and the custodian, eagerly following and watching their work. Children see adults doing marvelous activities, and children want to learn the skills to participate! Through practical life activities, children engage in culturally relevant tasks that allow them to feel like valuable members of their community. Supporting Orientation Orientation is a fundamental human tendency—we all seek to understand our surroundings and how to function within them. Practical life exercises help children orient to the Montessori classroom by introducing essential routines. For example, we take the time to teach children things that might otherwise be taken for granted, such as: How to carry a chair properly. How to greet a friend. How to roll and unroll a work rug. How to ask for help. By taking time to demonstrate these tasks, we show respect for the child and provide the knowledge they need to act confidently in their space. Supporting the Development of Concentration Practical life activities serve as a gateway to deep concentration. The freedom to choose and repeat exercises allows children to follow their intrinsic motivation and work toward self-perfection. When children reach deep concentration, they experience: Joy and a sense of fulfillment. An increased connection to others. A natural reduction in undesirable behaviors. The ability to repeat an activity for as long as needed also supports children’s sensitive period for order and mastery. This is why practical life often serves as the first point of engagement for children in the Montessori classroom. Supporting the Development of the Will Practical life exercises help children develop willpower and self-control by bridging the gap between impulse and deliberate action. At first, children act on instinct, but through repeated exercises, they learn to: Act consciously and voluntarily. Perfect their actions through self-correction. Develop grace, courtesy, and social awareness. Whether through learning how to clean up a spill or preparing snack to share with others, children learn to control their impulses and consider the needs of others. Dr. Montessori beautifully summarized this transformation in The Discovery of the Child: “The grace and dignity of their behavior and the ease of their movements are the corollaries to what they have gained through their own patient and laborious efforts. In a word, they are ‘self-controlled,’ and to the extent that they are thus controlled, they are free from the control of others.” Practical life is far more than just pouring, scrubbing, and folding—it is the foundation for independence, concentration, order, and social development. These carefully designed activities help children orient to their world, refine their movements, and develop the willpower to act with purpose. By embracing practical life, we give children the tools to engage meaningfully with their environment, take ownership of their learning, and ultimately, become confident, self-sufficient individuals. Contact us to schedule a tour so you can see how young children use practical life activities in powerful ways!