04/15/2026
Babies are born with an underdeveloped nervous system and rely on “co-regulation” from a caregiver’s body. Physical closeness helps stabilize an infant’s heart rate, breathing, and body temperature while lowering cortisol (stress hormone) levels. This shifts the baby into a calm state where energy is used for growth rather than survival.
By reducing chronic stress, frequent touch prevents the suppression of the immune system caused by high cortisol. Furthermore, skin-to-skin contact facilitates the transfer of beneficial bacteria (microbiome) from the parent to the baby, which helps build a stronger defense against infections.
Touch stimulates the release of oxytocin and other neurochemicals that drive synaptogenesis (the creation of neural connections). It specifically strengthens pathways between the prefrontal cortex (emotional control) and the limbic system (emotional processing), improving memory, learning and future self-regulation.
Repeated reassuring touch reinforces a “safety blueprint” in the developing brain. This consistent responsiveness builds a secure attachment, which is linked to lifelong benefits such as higher social confidence, greater emotional resilience, and healthier adult relationships.
Scientific findings from institutions like the Harvard Center on the Developing Child and research led by anthropologist James J. McKenna at the University of Notre Dame emphasize that these benefits are not about creating dependency, but about providing the essential biological support required for optimal human development.
SEE PMID: 32966905
