Why Do Kids Cry? A Scientist-Backed, Parent-Focused Guide for New Times
Written by Karola Marais, mother of three and sleep coach at The Sleep Co (www.thesleepco.co.za), hope this helps new parents understand why babies, newborns, toddlers, and children cry
Crying is an universal, biologically grounded form of communication that accompanies a child from newborn through childhood. Rather than a sign of “misbehavior,” tears reflect a complex interplay between biology, emotion, and social connection. This article distills the science behind crying while offering practical, compassionate guidance for parents navigating those intense moments with infants, toddlers, and older children. By understanding what tears do in the brain and body, caregivers can respond with warmth, attunement, and routines that support both emotional development and caregiver well-being.
Crying is more than emotion; it is biology in motion. All mammals produce tears to keep the eye moist and protected. But human tears include “psychic” tears—emotional tears with a unique chemical profile that includes leucine-enkephalin, an endorphin and natural pain killer—contributing to the sensation many describe as a “good cry.” Crying begins in the limbic system, the brain’s emotional hub, which works with the autonomic nervous system to regulate involuntary responses. The autonomic system has two branches: the sympathetic (arousal, react-and-pursue responses) and the parasympathetic (rest, processing, and regulation). As developmental scientist Deborah MacNamara notes, crying often starts in a sympathetic moment—think, “I can’t have that cookie,” or “I want more screen time”—but the full, streaming tears arrive as the parasympathetic system takes over, signaling a shift from pursuit to sadness and the recognition of futility in the hoped-for outcome. From there, the brain moves toward acceptance and adaptation, setting the stage for comfort, learning, and healing.
Physically, tears are produced by the lacrimal glands beside each eye. Tears serve both a secretory function (creating tears) and an excretory function (draining them). When emotion runs high, tears can mingle with mucus and fluid in the nasal passages, producing a runny nose—an everyday reminder of the body’s way of regulating emotion and clearing stress from the system. Early tears often reflect anger or frustration, described as an engine revving and momentarily getting stuck before gear shifts. The more intense “full-on ugly cry” signals that the child has moved into a new emotional state, ready to be soothed and supported. This is not random crying; it has social and evolutionary purposes. A sob that rises in a caregiver’s presence communicates a need for comfort, safety, and closeness, reinforcing attachment and guiding regulation.
Crying serves a critical social function beyond biology: it signals to those nearby that a child needs care. In evolutionary terms, crying invites caregivers into a protected space where emotional distress can be soothed, regulated, and eventually resolved. Responsive parenting—calm presence, gentle touch, and attuned listening—helps regulate the child’s nervous system, supports the development of emotion literacy, and strengthens secure attachment. Importantly, the caregiver’s own well-being matters too. Sustained distress without relief can lead to caregiver fatigue; thus, predictable routines, shared strategies, and self-care are essential for sustaining compassionate, effective responses.
Practical guidance for families emphasizes calm, attunement, and structure. When a child cries, stay present with a warm voice, eye contact, and soothing touch as appropriate. Validate the feeling: “I can see you’re upset. It’s okay to cry.” Provide comforting options—holding, rocking, a safe space, or a familiar object—to help regulate the nervous system. Read cues to distinguish cries signaling hunger, fatigue, overstimulation, discomfort, or a need for closeness, then respond with consistency. Predictable routines—sleep, feeding, soothing activities—reduce triggers and create a sense of security. If possible, offer choices within boundaries to foster a small sense of control (for example, “Would you like to be held or sit on my lap?”). Finally, remember to take care of yourself. Parent burnout makes soothing harder; take breaks, seek support, and practice self-care to keep your energy available for your child.
Age-specific notes can guide day-to-day practice. Newborns often cry to signal basic needs like hunger or discomfort; respond with feeding, burping, soothing motions, and a secure environment. Infants aged 3–12 months may cry from separation anxiety, teething, or overstimulation; maintain proximity, a soothing routine, and predictable responses. Toddlers tend to cry out of frustration with limits; offer simple choices, validate feelings, and teach coping strategies such as deep breathing or a comfort object. Preschoolers and older children may cry from fear or sadness; give space to cry, then engage in plain-language talk about feelings and problem solving when ready.
Therefore it is important to understand crying is a natural, healthy part of development. By marrying an understanding of the biology with compassionate, practical parenting strategies, you can respond in ways that support your child’s emotional growth while safeguarding your own energy and well-being.