This essay is the second in a series on the neurodevelopmental transition into motherhood. The first explored the cultural and psychological history of why this transition remained largely unmapped in Western medicine — and what non-Western traditions understood long before clinical science caught up. This essay turns to the body itself: what is physiologically happening in the weeks and months after birth, and why traditional postpartum practices were doing medicine all along.

For centuries, traditional midwives across cultures described the postpartum body in strikingly consistent terms — across different languages, different continents, different cosmologies — using a single word that recurs with quiet insistence:

Open.

This was not mystical language. It was observational vocabulary grounded in a different epistemology — one that tracked real physiological events with a precision modern medicine is only now beginning to formalize.

The Body That Is Still Becoming

In Ayurvedic medicine, the newly delivered woman is considered to be in a state of vata imbalance — the wind element is excessive, the body’s boundaries are permeable, and warmth must be actively protected and restored (Dhiman & Divyamol, 2022). In Traditional Chinese Medicine, the postpartum body is described as having depleted qi and blood, its channels open and vulnerable to cold and pathogenic invasion — hence the prohibition on cold foods, cold water, and exposure to wind during Zuò yuèzi (Holroyd et al., 2004). West African postpartum traditions similarly center heat: the Akan practice of fiemo in Ghana involves heated baths, warm herbal washes, and abdominal binding to “close” the body that birth has opened. In many Indigenous North American traditions, postpartum seclusion and specific dietary protocols serve to protect the woman in a recognized state of spiritual and physical vulnerability — a liminal opening that requires careful tending before she can re-enter the full social world.

This language was not merely symbolic. It was clinical language — embedded in a different epistemology — that often tracked real physiological processes with remarkable precision.

Consider what is actually happening in the postpartum body.

After delivery, the uterus carries a wound the size of a dinner plate where the placenta detached. This raw, vascular surface — the placental attachment site — takes approximately six to eight weeks to fully heal, and longer in cases of retained tissue or infection (Blackburn, 2018). The cervix, fully dilated during labor, gradually closes over days to weeks. The pelvic floor ligaments and connective tissue, softened and distended by the hormone relaxin throughout pregnancy, remain hypermobile and vulnerable for up to five months postpartum — significantly longer in breastfeeding women, who maintain elevated relaxin levels (Dehghan et al., 2014). The symphysis pubis, the joint connecting the two halves of the pelvis at the front, sustained mechanical stress during delivery that many women feel as a deep, aching instability.

The body is, in a very real sense, unfinished.

When traditional midwives called the postpartum body “open,” they were not speaking metaphorically. They were describing a biological reality: a body in active, incomplete reorganization — one that has not yet closed the processes that birth set in motion.

The Hormonal Freefall

The physical openness of the postpartum body is only one dimension of its reorganization. The hormonal architecture of recovery is equally profound — and equally underappreciated.

The dramatic collapse of estrogen and progesterone in the hours after placental delivery is one of the most abrupt endocrine shifts in human physiology (Walker, 2017). During pregnancy, these hormones circulate at levels hundreds of times above baseline. When the placenta is delivered, they fall with a speed that no other life event replicates. This single event, more than almost any other physiological factor, is implicated in the weeping, the shaking, the emotional volatility of the early days. The “baby blues” — the tearfulness that affects up to 80% of women in the first week — is not, at its core, an emotional response to the demands of new parenthood. It is a withdrawal response. The body is coming down from one of the most sustained hormonal states it has ever maintained.

This is not pathology. This is recalibration. The body is not breaking down; it is, in the language of systems neuroscience, transitioning between homeostatic set points — resetting its entire endocrine architecture for a new biological context. The analogy to withdrawal is not dramatic. It is biochemically accurate.

At the same time, a new hormonal architecture is being constructed. Oxytocin and prolactin — the hormones of bonding and lactation — are flooding neural circuits that have never been activated at this intensity before. They are rewiring the mother’s threat-detection system, her sensitivity to infant cues, and her capacity for social attunement (Feldman, 2017). The amygdala, the brain’s alarm center, becomes hyperresponsive to infant distress signals — a necessary adaptation for species survival, but one that is experienced, without context, as anxiety (Hoekzema et al., 2017).

The prefrontal cortex, the seat of executive function and emotional regulation, is simultaneously operating under severe strain: sleep deprivation, hormonal volatility, and the sheer metabolic cost of lactation are all drawing on the same neural resources. The result is a nervous system that is at once hypervigilant and depleted — exquisitely sensitive to the infant’s needs while running far below its usual capacity for higher-order regulation.

This is what “new mother” looks like from the inside of the brain. It is not weakness. It is the cost of a massive biological upgrade.

The Nervous System Under Reorganization

To understand why traditional postpartum practices were so physiologically coherent, we need to understand what the autonomic nervous system is doing in the weeks after birth.

Stephen Porges’ Polyvagal Theory offers a useful framework (Porges, 2011). The vagus nerve — the long nerve running from the brainstem through the heart, lungs, and gut — is the primary highway of the body’s parasympathetic nervous system: the “rest and digest” system that governs recovery, connection, and regulated calm. After birth, this system is under sustained pressure. Sleep deprivation chronically activates the hypothalamic-pituitary-adrenal (HPA) axis — the body’s stress response system — flooding the body with cortisol and keeping the sympathetic nervous system on high alert. The mother’s nervous system, meant to cycle between activation and recovery, gets stuck in a loop of activation.

The result is a dysregulated autonomic baseline: a nervous system that struggles to return to equilibrium, that reads small stressors as emergencies, and that has very little reserve capacity for the kind of co-regulation the infant is constantly demanding.

Because this is the other piece: the infant has no nervous system regulation of its own. Its capacity for self-regulation will develop over years, scaffolded by the co-regulation provided by its caregivers. In the meantime, the mother’s nervous system is doing double duty — regulating itself while simultaneously serving as the external regulatory system for a being who cannot yet regulate at all (Siegel, 1999). The metabolic and neurological cost of this is enormous and almost entirely invisible in how we talk about postpartum recovery.

What the Traditions Were Actually Prescribing

When we map traditional postpartum practices onto this neurophysiological reality, the coherence is striking.

Warm touch — the massage prescribed across Ayurvedic, West African, and Southeast Asian traditions — activates the C-tactile afferent nerve fibers that run just under the skin and project directly to the insular cortex and the vagus nerve. C-tactile stimulation is one of the most reliable triggers of parasympathetic activation in the human body (Uvnäs-Moberg, 2003). Put plainly: gentle, warm, sustained touch moves the nervous system from sympathetic overdrive toward parasympathetic recovery. It lowers cortisol. It increases oxytocin. It does, in physiological terms, exactly what a depleted postpartum nervous system needs most.

Heat — the warming foods, heated baths, and abdominal wraps prescribed across multiple traditions — supports uterine involution (the process by which the uterus contracts back toward its pre-pregnancy size), increases peripheral circulation to tissues that are still healing, and supports the immune function that is depressed in the postpartum period. The Akan practice of fiemo — in which the mother’s body is heated from the outside through baths and wraps — was not ritual performance. It was thermal medicine.

Dietary protocols — bone broths, iron-rich foods, warming spices, healthy fats — map directly onto the nutritional demands of the postpartum body. Iron is depleted through blood loss at delivery and through the sustained production of breast milk. The myelin sheaths of the neural pathways being reorganized require fat. The synthesis of serotonin, dopamine, and the other neurochemicals implicated in mood regulation requires amino acids from protein, along with B vitamins, zinc, and omega-3 fatty acids. The postpartum dietary traditions of most non-Western cultures, examined through a nutritional lens, read like a prescription for nervous system repair.

Enforced rest — the seclusion, the prohibition on domestic labor, the formal assignment of household tasks to other community members — is, from a neuroscience perspective, the most critical intervention of all. Sleep is the only mechanism by which the brain clears metabolic waste products through the glymphatic system — the neural “cleaning” process that only activates during deep sleep (Walker, 2017). Sleep is when the neurological changes of pregnancy are consolidated. Sleep is when stress hormones are regulated. Chronic sleep deprivation, sustained at the level experienced by most Western new mothers, is not merely exhausting — it is a neurological hazard. It mimics the cognitive profile of psychosis. It predisposes to mood disorders. It impairs the very neural circuitry that new mothers need most.

When traditional communities assigned themselves the job of watching the baby so the mother could sleep, they were not performing a kindness. They were doing neuroscience.

The Six-Week Problem

What Western obstetrics offers instead is a single postpartum appointment at six weeks — typically a brief uterine check, a cervical exam, and a depression screening — after which the mother is deemed recovered and cleared for full activity, including intercourse, exercise, and return to work.

The implicit message is that the body is finished closing at six weeks. The research says otherwise.

Pelvic floor recovery continues for months. Hormonal recalibration, particularly in breastfeeding women, can take the better part of a year; breastfeeding suppresses estrogen production, which means that some women are operating in a prolonged state of hormonal fluctuation that extends well beyond the standard recovery window. The neurological changes of matrescence, as Hoekzema and her colleagues demonstrated, persist for at least two years post-birth — and may be permanent (Hoekzema et al., 2017). The placental wound site re-epithelializes over six to eight weeks, but pelvic connective tissue remodeling continues for months beyond that (Dehghan et al., 2014).

The body doesn’t close on a medical system’s schedule. It closes on its own.

When we send women back to work at six weeks — back to full domestic labor at four, back to “normal” at a timeline set by insurance reimbursement rather than physiology — we are not accommodating the body’s healing. We are interrupting it. The emotional and psychological costs that surface months or years later in clinical offices — presenting as anxiety, depression, identity confusion, chronic fatigue, rage — are not unrelated to the season of becoming that was never allowed to complete itself.

The open body was never given the conditions to close.

The Protected Season

Imagine for a moment that the world understood the postpartum period the way it understands adolescence.

When a thirteen-year-old becomes volatile, introspective, distracted, and emotionally intense, we do not rush to diagnose a disorder. We recognize a developmental storm. We adjust expectations. We give the young person time for the brain and body to reorganize themselves around a new stage of life.

But when a woman becomes a mother — undergoing a neurodevelopment transformation at least as profound — we do the opposite. We expect immediate stability. Immediate competence. Immediate return to productivity. The problem is not that mothers are fragile. The problem is that we have mistaken a developmental passage for a performance review.

What cultures without a six-week discharge system understood — intuitively, empirically, encoded in ritual — is that the open body requires what I have come to think of as a protected season of becoming. Not a recovery period. Not a medical event with a clear discharge date. A season — with its own weather, its own rhythms, its own demand for a different kind of tending than ordinary life requires.

The traditional midwife who described the body as “open” was not speaking metaphorically. She was making a clinical observation. And the community that gathered to protect that opening — with warmth and food and rest and witness — was not performing a cultural custom.

It was doing medicine.

The open body and the reorganizing brain are not separate processes. They are two expressions of the same developmental transition. Which raises an obvious question: if the body is open and the brain is reorganizing, what is happening to the self caught between them?

That is the subject of the next essay.

Next in this series: The Identity Rupture of Becoming a Mother — what happens to the architecture of self when the brain, the body, and the nervous system are all in simultaneous reorganization.

References

Blackburn, S. T. (2018). Maternal, fetal, & neonatal physiology: A clinical perspective (5th ed.). Elsevier.

Dhiman, K., & Divyamol, M. D. (2022). Sutika paricharya — strategies for safe postnatal care in Ayurveda. Journal of Ayurveda and Integrated Medical Sciences, 7(3), 101–106.

Dehghan, F., Haerian, B. S., Muniandy, S., Yusof, A., Dragoo, J. L., & Salleh, N. (2014). The effect of relaxin on the musculoskeletal system. Scandinavian Journal of Medicine & Science in Sports, 24(4), e220–e229.

Feldman, R. (2017). The neurobiology of human attachments. Trends in Cognitive Sciences, 21(2), 80–99.

Hoekzema, E., Barba-Müller, E., Pozzobon, C., Picado, M., Lucco, F., García-García, D., ... & Vilarroya, O. (2017). Pregnancy leads to long-lasting changes in human brain structure. Nature Neuroscience, 20(2), 287–296.

Holroyd, E., Katie, F. K. L., Lui, L., & Tak-ying, S. A. (2004). “Doing the month”: An exploration of postpartum practices in Chinese women. Health Care for Women International, 25(10), 899–915.

Porges, S. W. (2011). The polyvagal theory: Neurophysiological foundations of emotions, attachment, communication, and self-regulation. W. W. Norton & Company.

Siegel, D. J. (1999). The developing mind: How relationships and the brain interact to shape who we are. Guilford Press.

Uvnäs-Moberg, K. (2003). The oxytocin factor: Tapping the hormone of calm, love, and healing. Da Capo Press.

Walker, M. (2017). Why we sleep: Unlocking the power of sleep and dreams. Scribner.

Originally published on Substack.