Stages of Development Series: Infancy

Meagan Ledendecker • 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!

Close up image of a child's hands holding a small green square card printed with the word
By Meagan Ledendecker February 27, 2026
In this blog post, learn more about how Montessori classrooms help children bring to consciousness language they already use every day by learning about how language functions and how meaning is carried when words stand in for each other.
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By Meagan Ledendecker February 27, 2026
March 1 marks Baby Sleep Day, so we thought we’d take a moment to reflect on the alignment between Montessori philosophy and modern sleep science. In Montessori, we focus on independence as a path toward self-sufficiency. This is a gradual, mindful process of becoming capable. For our youngest children, this journey begins with mastery of the most fundamental human needs: eating, toileting, and sleeping. These areas matter deeply because they are ultimately under a child’s control. No one can make a child eat, use the toilet, or sleep. Our role, then, is not to force outcomes but to remove obstacles. As adults, we can provide thoughtful structure and support children as they develop the skills that build confidence and trust in their own bodies. Language Shapes Our Intentions In Montessori, our language reflects our values. For example, we don’t talk about “toilet training.” Instead, we focus on “toilet learning” because children are learning how to care for their bodies within the cultural norms. We are not training behavior. We are supporting development. The same is true for sleep. Rather than “sleep training,” Montessori invites us to think in terms of supporting independent sleep skills. We help children learn how to settle their bodies, self-soothe, and eventually fall asleep independently, all skills they will rely on for the rest of their lives. Why Sleep Matters So Much Research continues to affirm that sleep is foundational. Healthy sleep supports brain development and learning, emotional regulation, physical growth and immune function, and memory and attention. During sleep, children’s bodies perform essential functions, including muscle growth, tissue repair, protein synthesis, and the release of growth hormones. Deep sleep stages are when the most restorative processes occur. How Sleep Works  Two systems guide sleep: circadian rhythm and sleep pressure. Circadian rhythm is the body’s internal 24-hour clock, regulated by light and darkness. When it’s dark, the brain releases melatonin (the sleep hormone). When it’s light, melatonin decreases, and cortisol helps us wake. This is why darkness supports sleep, blue light from screens disrupts it, and consistent bedtimes matter. Newborns are not born with a mature circadian rhythm. It begins developing around six weeks and becomes more established around three months, which explains why early baby sleep can feel unpredictable. The other factor is sleep pressure. The longer we’re awake, the stronger the drive to sleep. This pressure builds during the day and resets after a long stretch of rest. When children miss their sleep window and become overtired, stress hormones (adrenaline and cortisol) kick in, creating that familiar “second wind.” Suddenly, a child who desperately needs sleep seems wired and alert. Understanding sleep pressure helps us time sleep before children tip into exhaustion. A Montessori Framework for Healthy Sleep To support both healthy attachment and independence, Montessori encourages clear, loving boundaries. Sleep is no different. We can focus on four key factors: a prepared sleep environment, predictable and respectful routines, healthy sleep associations, and limits with flexibility. A Prepared Sleep Environment Just as we prepare our Montessori classrooms, we want to be intentional about preparing our child’s sleep space at home. Key components include ensuring that the space is: Dark (blackout curtains help melatonin production) Quiet and calm Free of stimulating toys Slightly cool A good question to ask ourselves is: Would I easily fall asleep here? Predictable, Respectful Routines Children feel secure when they know what comes next. A simple home routine might include: The final feeding Putting on pajamas Toileting/diapering Tooth brushing A short story or song A hug and kiss goodnight Long baths or extended reading are best before the sleep window, not during it. Healthy Sleep Associations Children form associations with the conditions present when they fall asleep. If a child falls asleep being rocked, fed, or held, they will often need that same support during natural night wakings. Instead, we want to place a child in bed drowsy but awake, so they can practice falling asleep independently. Comfort objects, such as a small blanket or stuffed animal, can support this process. Limits with Flexibility Sleep needs change as children grow. Consistency matters, but we don’t want to be unnecessarily rigid. It’s important to keep in mind, though, that older children may test boundaries, delay routines, or negotiate endlessly. Calm, consistent follow-through reassures children that the structure is dependable. And just as importantly, adults need support, too! Holding limits is much harder when we are sleep-deprived, so self-care is essential. Why Independent Sleep Is an Act of Care Babies naturally cycle through light and deep sleep many times each night. When they wake briefly between cycles, a child who knows how to self-settle can drift back to sleep without distress. Independent sleep skills: Reduce frequent night wakings Support early morning sleep Improve mood and learning Protect parents’ well-being Plus, poor sleep in infancy is linked to challenges later in childhood, including difficulties with emotional regulation and health concerns. Supporting sleep early is preventative care. A Closing Thought for Baby Sleep Day Supporting sleep is not about forcing independence. It’s about preparing the conditions so independence can emerge naturally, with confidence and trust. If you’re navigating sleep challenges, please know this: you don’t have to do it alone. Sleep is learned, supported, and refined over time (just like every other human skill!). We want to honor sleep not as a struggle to overcome, but as a vital rhythm to protect, for both our children and ourselves. If you are interested in learning more, schedule a visit here in Lenox today!
By Meagan Ledendecker February 23, 2026
One of the quieter, less visible practices in a Montessori elementary classroom is the Child-Guide conference. You may never see it listed on a schedule or mentioned in a weekly update, yet it plays a profound role in children’s experience at school. Relationship Comes First The primary purpose of these conferences is to establish, maintain, and strengthen the relationship between the adult and each child. This focus shifts the dynamic from a teacher looking for faults or scolding about unfinished work. Rather, it’s a collegial conversation that enables children to take an active and engaged role in their own education. These connective conversations are grounded in relationship-building because when children feel emotionally safe and genuinely respected, they are far more willing to reflect, stretch themselves, and take responsibility for their growth. Every Child, as Often as They Need Montessori Guides aim to meet regularly with every child, but what “regularly” looks like can vary based on individual needs. Some children benefit from a longer, more formal conference every few weeks. Others need brief, frequent check-ins, sometimes lasting only a minute or two. These short moments might look like a quick conversation at the beginning of the morning, a gentle pause beside a table, or a quiet walk across the room together. The length of the meeting is not what matters. What is important is the message it sends: “I see you. I know your work. I care about how this is going for you.” What Happens in a Child-Guide Conference? While conferences vary based on each individual and the moment, they often include: The child bringing their learning journal or work (finished and unfinished) The guide bringing observational records A shared look at what has been accomplished Gentle reflection on what still feels unfinished Planning for what might come next Scheduling new lessons or presentations Support with larger projects: breaking them into steps, mapping timelines, imagining the finished product This collaborative time also provides an opportunity to experiment with new strategies (“Would you like to try creating a prioritized list?”), celebrate successes (“You worked so hard on your presentation! How did it feel to share your work?”), and reflect upon challenges (“It seems like you’ve been feeling a bit stuck in your research project. Tell me more about what is going on.”). Learning to Define “Finished” One of the most freeing lessons children learn in Montessori is that not every piece of work must be finished to an adult’s standard. Sometimes children accomplish exactly what they set out to do, and continuing would add nothing meaningful. Other times, interest has naturally ended, and letting go is healthy. This is not about lowering expectations. It is about honoring children’s internal sense of completion and learning when to release what no longer serves a purpose. Trusting Children’s Self-Assessment A cornerstone of these conferences is trust. Guides listen carefully to how children assess their own work and articulate their goals. When an adult truly accepts children’s self-assessment, something powerful happens: children begin to see themselves as capable, thoughtful, and worthy of being taken seriously. Children often receive more from the tone and sentiment of these meetings than from the actual content discussed. The Whole Child Matters Because Montessori education is concerned with the whole child, conferences may naturally move beyond academics. A Guide might gently offer support with social dynamics or ask about recent struggles during outdoor time. These moments provide a safe space for children to reflect on their own social, emotional, and physical development, and to recognize that there is a network of support. When Relationships Need Repair Even in the most thoughtful classrooms, relationships can become strained. What matters is how adults respond. It is never too late for a Guide to sit with a child and say, honestly: “I’ve been thinking about how we’ve been interacting recently, and I’d love to brainstorm with you about what I could do differently.” When an adult takes responsibility, without demanding the child do the same, something shifts. Trust begins to rebuild. Real dialogue becomes possible. Children learn from this modeling. In time, after they feel safe, they often step forward to take responsibility themselves. What Children Are Really Learning Through these quiet, intentional meetings, children learn that:  their thoughts and feelings matter, adults can be trusted, mistakes are part of growth, reflection leads to independence, and relationships can be repaired. And while these conferences may happen quietly in a corner of the classroom, their impact echoes far beyond it. This is true preparation for life. To learn more about the long-term benefits of Montessori, visit us here in Lenox, MA!
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