Stages of Development Series: Infancy
Julie Douglas • 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!


Geometry From the Start
September 15, 2025
Find out how children in Montessori environments development knowledge of Geometry.
Separation Anxiety: Why It’s Normal and What You Can Do
By Julie Douglas September 8, 2025
Every fall, the doorways of classrooms become a place of transition. Children are often excited to skip into their school environment, eager to learn and play. Unfortunately, many children experience some level of separation anxiety, particularly when they are very young. The good news? This is totally normal! Read on to learn more about why, and what you can do to help your child feel good about the time you spend apart. What does it look like? Separation anxiety is completely normal. Most young children experience it at some point, and although it can cause stress for both the child and their parents, it’s actually a healthy part of development, especially during the toddler years. Separation anxiety can manifest in many forms. Parents might see their child display some of all of the following behaviors: Crying Physically clinging to parent Loud protesting Persistent worry when separated from parent(s) Separation anxiety typically doesn’t last very long for most children and resolves itself within a few weeks. Once toddlers begin to realize that their parents will actually return, their fears tend to alleviate. Even older children can experience short-lived bouts of separation anxiety. These times are often even harder for parents, but it’s all perfectly normal! Why does it happen? There are a variety of reasons children may experience separation anxiety, but as we mentioned above, it most often occurs during the toddler years. Any time from about 7 months of age through 2-3 years of age, children may go through a phase during which separating from their parents can be quite upsetting. For infants, it’s about differentiating between strangers and people they know. This is obviously an important and healthy part of their development, although it can be heart wrenching when dropping your little one off with care givers in the morning before you head to work. As children get a little older, the reasons shift toward a fear that the parent may leave and not return. After a period of time, the child learns to trust that the separation is temporary, and the anxious behaviors subside. There are plenty of other reasons why a child may experience separation anxiety. If they are tired, not feeling well, or are experiencing stress or a period of transition in their life, they may feel the need to be closely attached to their parent(s). These feelings are typically short-lived and resolve themselves once the child feels some level of reassurance or once the underlying cause is no longer an issue. What can we do? Each child is different, but the following are some strategies that tend to work well for most families: Set aside some extra time in the morning. The simple act of not rushing can create a sense of calm for both you and your child, but it also leaves a few extra minutes for some cuddles. Create a routine. When your child knows what to expect, they will feel more able to trust that everything is okay. This may mean singing a special song in the car on the way to school, walking to the front door together, and making sure to squeeze in one last hug. Find whatever routine works for you and for your child. Be consistent. Once you’ve established a routine, stick to it. This can be a challenge, but it is so important and will do so much to help a child who is feeling anxious. Of course, life has a way of interrupting our plans and routines (especially when you’re trying to get out the door with a young child!) but try to be as consistent as possible. Don’t linger, but don’t sneak away. Staying too long can intensify feelings of anxiety when you do leave, and leaving without your child’s knowledge isn’t the greatest idea, either. They may experience feelings of worry or sadness, but they will also be more likely to trust if they know when a parent is leaving. Ask your child’s teacher or caregiver for advice. Chances are, they have had lots of experience with separation anxiety in children. Teachers are often masters of distraction and redirection, which can help you make a peaceful exit. What if it’s more? Once in a while, separation anxiety is more than a phase. Again, your child’s teacher is a good person to consult if you’re concerned. If your child is well past their toddler years, if their anxiety is affecting them in multiple parts of their lives, or if behaviors are stretching past weeks and into months, it can sometimes help to talk to your child’s pediatrician. Separation anxiety disorder is a more severe and persistent version of what most children experience. The good news is, even children who experience SAD have options to help them overcome their fears and work toward healthy, trusting, and confident periods of separations from their parents. Want to learn more? Check out this fantastic article for helpful tips.