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!


Child using color-coded word cards to explore pronouns in a Montessori language activity.
March 9, 2026
When children begin working with pronouns in Montessori, they are not learning something entirely new. Instead, they are bringing to consciousness language they already use every day. Pronoun work builds slowly and intentionally. It is not about mastering grammar rules, but about understanding how language functions and how meaning is carried when words stand in for one another. Beginning With Experience, Not Explanation Montessori pronoun work begins with movement and spoken language, not written grammar. We start with little oral games to highlight how a pronoun functions, sometimes eliminating the pronoun (“Josie and John and Jack and Josiah are walking around the table.”) and other times emphasizing the pronoun (“They are walking around the table.”). The children love acting out the phrases, sometimes chanting, moving, watching one another, and laughing. Through these physical experiences, they begin to notice that we don’t always use names when we speak. Certain words take the place of a noun, and the meaning is still clear. At this stage, we don’t offer the term pronoun because we want children to simply experience its function. From Movement to Sentences Once children are ready for more structured language work, we introduce them to the Pronoun Grammar Box so they can build and rebuild sentences using color-coded cards for each part of speech. From one sentence to the next, only a few words change as nouns get replaced by pronouns. By comparing sentences, children discover that although the word changes, the sentence still makes sense. This comparison is essential. Rather than being told what a pronoun is, children see what it does. We then invite children to add grammar symbols to the sentence (noun, article, adjective, verb, preposition, adverb) until we finally draw attention to the remaining word: “This word is used in place of a noun.” Only then do we introduce the pronoun symbol: a purple isosceles triangle, the height of the noun symbol. Montessori Lore: The Pronoun’s Story There’s a beloved story about the pronoun symbol. Long ago, the pronoun was shorter and a different color. Wanting to be as important as the noun, it stretched itself taller and taller to reach the same height. As it stretched, its base became smaller and it turned purple from the effort of standing in the noun’s place. It’s a poetic reminder of what children discover through their work: a pronoun depends on the noun, borrowing its meaning while standing in for it. Why Pronouns Come Later Pronouns are more abstract than other parts of speech. To understand a pronoun, children must already have a strong, concrete understanding of the noun. For this reason, pronouns (along with interjections) are typically introduced later than other grammar symbols, often in the elementary years. Even then, one lesson is not enough. In Montessori, the real learning happens after the presentation, when we step back and children work independently with the material. The guide’s role is to show how to use the material, not to explain grammar in detail. Understanding emerges through repeated use. Deepening Understanding Through Play and Exploration As children grow more confident, the work expands to include: Transposition games, where pronouns are removed or replaced to explore how meaning changes. Command cards, which physically isolate pronouns through action. Personal pronoun charts, introducing first, second, and third person (singular and plural) through storytelling. The Verb Family, where children explore the close relationship between the verb, adverb, and pronoun. Children discover that pronouns often work closely with verbs, helping to carry action and meaning through a sentence. Subtleties Come Later At first, Montessori avoids getting caught in fine distinctions. Over time, children may explore nuances such as the difference between possessive pronouns (the book is mine) and possessive adjectives (my book). These discussions often happen later, sometimes with the support of grammar references, once children have a solid foundation. Language Revealed, Not Taught Through this carefully layered progression of movement, sentence work, symbols, and exploration, children develop a deep understanding of how words function differently in sentences. Montessori grammar invites children to discover how language works at their own pace through hands-on exploration. We don’t rush this process. So by the time children are ready to name the pronoun, it’s not a new idea. It’s something they already know. We invite you to visit our classrooms in Delran, New Jersey to see firsthand the children’s joy of learning!
Newborn baby sleeping peacefully, illustrating Montessori-inspired healthy infant sleep.
March 2, 2026
Sleep is a skill children develop with support, trust, and preparation. This reflection explores how Montessori philosophy aligns with sleep science to support healthy rest for children and parents.