Stages of Development Series: Infancy and Primary Years 0-6 years old
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!


October 27, 2025
Since the pandemic, we can find ourselves carrying new or heightened worries about our children’s social lives. We can have concerns about whether our children “lost time” with peers during critical developmental years. Or maybe it’s worry about shyness, reluctance in groups, or how screen time may have replaced face-to-face play. Even now, long after schools and activities have reopened, it’s common for anxiety to surface: Is my child making enough friends? Are they socially behind? Why We Feel This Way The truth is, these concerns are natural. COVID disrupted our social connections, and children being with other children is an important part of childhood. For months (and for some even years), daily opportunities to share space, work through conflict, and experience the joy of play were limited. Add in the reality of increased screen use, the culture of comparison amplified by social media, and children who may show hesitations around groups, and it’s easy to see why we are carrying this extra layer of worry. What Montessori Reminds Us Montessori provides us with a helpful perspective: growth is not lost, it is simply unfolding in its own time. Children are incredibly resilient. Social development isn’t a race, and there isn’t one perfect timeline. Just as each child learns to walk or read at their own pace, children find their own paths into friendships and community life. How We Can Support Children (and Ourselves) So, what can we do to ease our own (and our children’s) anxiety while supporting their social growth? First, remember that depth of connection matters more than numbers. A child with one or two genuine friendships has a strong foundation. In Montessori classrooms, we often see that meaningful, sustained interactions carry more value than a large peer group. Second, provide opportunities for natural interaction rather than overscheduling. Time at the park, family gatherings, or small playdates often offer more authentic growth than tightly managed activities. In the classroom, children practice collaboration daily, from sharing materials to working on group projects. Third, support independence. After COVID, it’s natural to want to step in quickly if our child seems uncomfortable socially. But small moments of trust—like letting our children introduce themselves, ask to join a game, or resolve a conflict—help them build confidence and resilience. Finally, model calm and social grace. Children absorb how we approach social situations. When they see adults showing openness and curiosity, they are more likely to approach peers with the same ease. Partnering with Teachers Your child’s teacher is also a valuable partner. Montessori guides closely observe children’s social interactions and can offer concrete reassurance: “I noticed your child inviting a friend to join her work,” or “He showed patience while sharing materials today.” These insights often show growth that may not be as apparent outside the classroom. Supporting Social Growth at Home Simple, practical activities in our children’s lives can make a big difference. Hosting a “work together” playdate, for instance, shifts the focus from entertainment to shared purpose. Children might bake bread, build with blocks, or create art together. These collaborative activities naturally encourage conversation, cooperation, and problem-solving, giving children structured opportunities to navigate relationships. Practicing grace and courtesy at home also builds confidence. Small role-plays, like how to join a game or politely declining an invitation, help children learn the social scripts they need. Learning how to insert themselves into play: “What are you playing? I’ll join too!” or “No, thank you. I’d like to work alone right now,” are examples that may seem small but make a significant difference when children encounter peers in real settings. Family game nights are another excellent tool. Cooperative board games, memory games, or card games teach turn-taking, handling winning and losing, and joyful connection. Games provide low-stakes opportunities to practice critical social skills like patience, negotiation, and flexibility. Finally, spending time in community spaces offers invaluable real-world practice. Visits to the library, farmers’ market, or nature center allow children to engage in everyday interactions, such as greeting a librarian, asking a vendor a question, or navigating shared space with peers. These experiences help children build confidence and fluency in social settings. Moving Forward with Confidence It’s understandable to feel anxious about our child’s social life after such a collective disruption. But rest assured: children are not permanently “behind.” With trust, time, and supportive environments, children continue developing the skills of friendship, collaboration, and community. Montessori reminds us that growth is steady and ongoing. Our role is to provide the space, opportunity, and confidence children need to thrive socially. When we step back and trust the process, we discover that children are, in fact, developing social competence. Come schedule a tour of our classroom environments in Oak Park, IL to see how Montessori fosters a lasting sense of confidence and a deep form of belonging.
Human Tendencies: Why Montessori Still Feels So Relevant
October 6, 2025
From curiosity to self-control, Montessori aligns with the human tendencies that help children grow, adapt, and flourish.