Infant Mental Health: Why the Earliest Years Matter

By Heather Hodgins-Chan, OT Reg. (Ont.), Psychotherapist
On The Ball Pediatric Physio and Occupational Therapy serving families in Kanata and Orleans, Ottawa

The earliest relationships shape the developing brain; understanding infant mental health can help families support regulation, sleep, sensory processing, and emotional development from the very beginning of life.

Over many years of clinical practice as a pediatric occupational therapist, I have had the privilege of working with hundreds of children and families. One pattern that has consistently emerged in my clinical experience is that many of the children who present with sensory processing differences, emotional regulation challenges, and behavioral concerns often have early developmental histories that include significant stressors. Some children were born prematurely; others experienced complicated or assisted deliveries; some experienced extremely rapid births; others required medical support shortly after birth or time spent in the neonatal intensive care unit. In some cases, children were exposed to substances such as alcohol or drugs during pregnancy. These early experiences can place stress on the developing nervous system and increase vulnerability to difficulties with regulation later in childhood.

Many people are unaware that occupational therapists can help support self regulation in babies. When infants struggle with sleep, feeding, settling, or sensory sensitivities, occupational therapy is often not the first profession that comes to mind for families seeking support. However, pediatric occupational therapists frequently work with infants and parents to help organize the developing nervous system. Occupational therapy sessions may include approaches such as sensory integration strategies, identifying sensory processing differences, supporting sleep and feeding routines, and providing parent education to help caregivers understand their baby's cues and regulatory needs.

Understanding Infant Mental Health and Early Brain Development

Because of this, it has become increasingly important to pay close attention to infant mental health. The earliest months and years of life represent a period of extraordinary brain development. During this time, the architecture of the brain is shaped through experience, particularly through relationships with caregivers.

Infant mental health refers to the developing capacity of infants and toddlers to form secure relationships, experience and regulate emotions, explore their environment with curiosity, and feel safe in the world. These abilities do not develop in isolation; they emerge within the context of responsive caregiving relationships that help organize the developing nervous system.

The importance of early relationships in shaping the brain has been clearly articulated by the Center on the Developing Child at Harvard University. In their report on early childhood development, the authors explain that “serve and return interaction between young children and their caregivers builds and strengthens brain architecture” (Center on the Developing Child at Harvard University, 2016). These repeated back and forth interactions between caregiver and child form the foundation for emotional regulation, learning, and social development.

Research in developmental neuroscience has also demonstrated that caregivers and infants become biologically synchronized during interaction. Dr. Ruth Feldman, a developmental neuroscientist and professor of psychology and neuroscience, is widely recognized as a leading researcher in the field of parent infant synchrony. Through a series of influential studies examining behavioral, hormonal, and neural coordination between parents and infants, Dr. Feldman has demonstrated that early synchronous interactions between caregivers and babies help shape the developing social brain.

Dr. Feldman’s research shows that when parents and infants engage in coordinated interactions such as eye contact, vocal exchange, facial expression, and touch, their physiological systems begin to synchronize. These synchronized interactions influence the development of neural circuits involved in emotional regulation and social communication. Neuroimaging and physiological studies have suggested that caregiver and infant brains can activate related neural networks during moments of attuned interaction. This process of interpersonal synchrony is believed to play a foundational role in the development of emotional regulation and social engagement.

One of the most powerful demonstrations of the importance of caregiver responsiveness comes from the well known Still Face Experiment conducted by developmental psychologist Dr. Edward Tronick. In this experiment, a mother first interacts normally with her baby. The baby smiles, vocalizes, and engages in a lively back and forth exchange with the caregiver. After a brief period, the mother is asked to maintain a neutral expressionless face and stop responding to the baby.

Within a very short period of time, the infant attempts repeatedly to re engage the caregiver. The baby smiles, gestures, and vocalizes in an effort to restore the interaction. When the caregiver continues to remain unresponsive, the infant becomes visibly distressed; many infants begin to fuss or cry, avert their gaze, or show signs of physiological stress. The experiment illustrates how profoundly infants rely on responsive interaction for emotional regulation. When caregivers are attuned and responsive, the infant’s nervous system can remain organized. When this responsiveness is disrupted, even briefly, the infant’s regulatory system becomes challenged.

Sensory Processing in Babies and Early Signs Families May Notice

Another important factor in early development is sensory processing. Infants experience the world primarily through their sensory systems. Movement, touch, sound, light, and body awareness provide the raw information that the brain uses to organize itself. Some babies have nervous systems that are particularly sensitive to sensory input; these infants may startle easily, have difficulty settling, struggle with sleep, or become overwhelmed in stimulating environments. Other infants may appear quieter or less responsive and may require more sensory input to become alert and engaged.

Recognizing sensory processing differences early can help families support their child’s development in meaningful ways. Occupational therapists who work with infants consider many aspects of early development including sensory responses, motor development, regulation patterns, feeding and sleep routines, and the quality of parent infant interaction. When challenges are identified early, small adjustments to the environment and caregiving routines can make a meaningful difference in how the infant’s nervous system organizes itself.

Maternal and parental mental health is also deeply intertwined with infant mental health. Caregivers who are experiencing stress, anxiety, or exhaustion are not doing anything wrong; caring for a baby can be one of the most demanding transitions in life. However, research consistently shows that caregiver well being influences the quality of parent infant interaction. When caregivers receive support, education, and reassurance, they often feel more confident in responding to their baby’s cues. This confidence helps create the predictable, nurturing environment that supports healthy development.

Early intervention can be particularly powerful because the developing brain is highly adaptable during infancy. Supporting regulation, strengthening the parent infant relationship, and recognizing sensory processing differences early can help build the foundation for later emotional health, learning, and social development.

Pediatric Occupational Therapy Support for Infants in Kanata and Orleans

For families who notice challenges related to sleep, feeding, regulation, or sensory sensitivities in their baby, speaking with a pediatric occupational therapist can provide valuable insight and guidance. Early support is not about identifying problems; it is about understanding how each child’s nervous system is developing and helping families create the conditions that allow their child to thrive.

Families in Kanata, Orleans, and the greater Ottawa area who have questions about infant development, sensory processing, sleep, or emotional regulation can connect with the team at On The Ball Pediatric Physio and Occupational Therapy. Our pediatric occupational therapists work closely with parents and caregivers to support infant mental health, strengthen early relationships, and help babies develop the foundations for healthy growth and learning.

The earliest relationships shape the brain in ways that last a lifetime. By supporting infant mental health and caregiver well being, we can help children build strong foundations for emotional regulation, resilience, and lifelong learning.

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References

Center on the Developing Child at Harvard University. (2016).
From Best Practices to Breakthrough Impacts: A Science Based Approach to Building a More Promising Future for Young Children and Families.

Feldman, R. (2012).
Parent infant synchrony and the construction of shared timing; physiological precursors; developmental outcomes; and risk conditions.
Journal of Child Psychology and Psychiatry.

Feldman, R. (2015).
The adaptive human parental brain; implications for children's social development.
Trends in Neurosciences.

Atzil, S., Hendler, T., & Feldman, R. (2011).
Specifying the neurobiological basis of human attachment.
Proceedings of the National Academy of Sciences.

Tronick, E. (1978).The still face paradigm and the infant's response to caregiver unresponsiveness.Journal of the American Academy of Child Psychiatry.

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