Boiling water during childbirth was, and in many parts of the world still is, primarily about killing germs. Before sterilized equipment and clean running water were widely available, boiling was the simplest way to make water safe for washing hands, cleaning instruments, and preparing cloths that would come into contact with the mother and newborn. The practice sounds quaint in the age of hospital-grade antiseptics, but it addressed a real and deadly problem: infection during and after delivery was one of the leading causes of maternal and newborn death for centuries, and contaminated water or instruments were often the vehicle.
How Infection Became Childbirth’s Deadliest Enemy
For most of human history, nobody understood why so many mothers and babies died of fever in the days following birth. Puerperal fever, sometimes called childbed fever, swept through maternity wards in waves. In the 1800s, the mortality rate for patients admitted to hospitals was three to five times greater than for those cared for at home, largely because doctors moved from patient to patient, and even from autopsies to deliveries, without washing their hands.1Frontiers in Public Health. The little-known history of cleanliness and the forgotten pioneers of handwashing The bacteria responsible for these infections thrived on unwashed hands, unsterilized tools, and anything else that touched a fresh wound or an exposed umbilical stump.
Once germ theory gained acceptance in the late 1800s, the logic of boiling water became obvious: a rolling boil for several minutes kills the vast majority of bacteria, viruses, and parasites that cause wound infections and fever. In a home birth setting without access to an autoclave or chemical disinfectants, a pot of boiling water was the most reliable sterilization method available. It was not a ritual or a superstition. It was practical microbiology, understood intuitively long before anyone could name the organisms involved.
What the Boiled Water Was Actually Used For
The classic movie scene of someone frantically boiling water while a woman labors in the next room leaves out the details of what the water was for. It had several overlapping uses, all related to cleanliness:
- Handwashing: Birth attendants needed clean, warm water to scrub their hands before examining the mother or handling the baby. Soap alone does not kill spore-forming bacteria like the ones that cause tetanus; heat does.
- Instrument sterilization: Scissors or a blade used to cut the umbilical cord could introduce lethal infections if contaminated. Submerging them in boiling water was the standard method to sterilize them in a home setting.
- Clean cloths and compresses: Rags, towels, and strips of fabric used to clean the mother, apply pressure, or wrap the baby were boiled to kill pathogens. Fabric can harbor bacteria even when it looks clean.
- Wound cleaning: Water used to wash any tears, abrasions, or the umbilical stump needed to be free of contamination. Tap water or well water was not reliably safe in most places until the twentieth century, and in many regions it still is not.
In short, boiling water was the all-purpose infection-control step. It turned an unpredictable resource (whatever water was available) into something consistently safe enough to touch open tissue.
Cutting the Cord Safely
One of the most critical uses for sterilized water and instruments was the cutting and dressing of the umbilical cord. Neonatal tetanus, caused by the bacterium Clostridium tetani, was historically one of the biggest killers of newborns worldwide. The spores of this bacterium live in soil and dust and can contaminate any unsterilized cutting tool or dressing material. When those spores enter the freshly cut cord stump, the resulting infection is often fatal.
Research on traditional birth attendants in regions where neonatal tetanus remained common has shown how fragile the chain of sterile practice can be. In a study of birth attendants in an endemic area of Thailand, roughly eighty percent claimed to sterilize their instruments, yet about forty percent still dressed the umbilical stump inappropriately, using various powders that could introduce contamination.2Springer Link / PubMed Central. Traditional birth attendants in an endemic area of tetanus neonatorum in Thailand: pitfalls in the control program Trained attendants had better knowledge of sterile cord-cutting and dressing techniques than untrained ones, but even among the trained group, compliance was uneven. The lesson is clear: boiling water and instruments was the right idea, but it only worked if every step in the chain, from cutting to dressing to handling, stayed clean.
Warm Compresses and Perineal Care
Beyond sterilization, warm water served a second purpose during labor that had nothing to do with killing germs: comfort and tissue protection. Applying warm, moist cloths to the perineum during the pushing stage of labor is an old practice that modern research has validated surprisingly well.
A systematic review and meta-analysis pooling data from multiple trials found that warm perineal compresses significantly reduced second-degree tears, third-degree tears, fourth-degree tears, episiotomy rates, and postpartum pain, while tripling the chance of the perineum remaining intact compared to no compress.3PubMed. The effects of warm perineal compress on perineal trauma and postpartum pain: a systematic review with meta-analysis and trial sequential analysis A randomized trial found that women who received perineal massage combined with warm compresses had an intact perineum rate of 47%, compared to about 26% in the control group.4PubMed. Perineal massage and warm compresses – Randomised controlled trial for reduce perineal trauma during labor Another trial confirmed that warm compresses reduced the severity of tears and lowered pain intensity both during and after delivery.5PubMed Central. The effect of warm compresses on perineal tear and pain intensity during the second stage of labor: A randomized controlled trial
The warmth relaxes the perineal muscles and increases blood flow to the tissue, making it more elastic and less likely to tear as the baby’s head crowns. This is not a minor benefit. Severe perineal tears can cause long-term problems with continence and pelvic floor function. So when someone in the delivery room calls for hot water and clean cloths, part of what they are doing is preparing compresses that will protect the mother’s tissue during the most physically demanding moments of labor.
Water Immersion During Labor
A related but distinct use of warm water in childbirth is hydrotherapy, where the laboring person sits or reclines in a tub of warm water during contractions. This practice has grown in popularity in hospitals and birth centers over the past few decades, and the evidence for pain relief is reasonably good. A systematic review concluded that immersion in warm water during childbirth has a relaxing effect that can relieve pain and reduce the likelihood of stress-hormone spikes, potentially avoiding the need for pharmacological pain relief in some cases.6PubMed Central. Systematic Reviews and Synthesis without Meta-Analysis on Hydrotherapy for Pain Control in Labor
One trial comparing water immersion during labor to conventional care found that pain scores were substantially lower in the water group, both at 30 minutes and 60 minutes after labor was established.7PubMed Central. A comparison of maternal and neonatal outcomes between water immersion during labor and conventional labor and delivery That said, the picture is not universally positive. Another randomized controlled trial found that pharmacological pain relief use was similar between the immersion group and the control group, with about 85% versus 77% using major analgesia. Women in the routine care group actually rated their overall childbirth experience more positively than those in the bath group in that particular study.8PubMed. Immersion in water in the first stage of labor: a randomized controlled trial So while warm water immersion can help, it is not a guaranteed replacement for other forms of pain management.
One genuine safety concern with hydrotherapy in labor is water temperature. If the water is too hot and the mother is immersed for too long, there is a risk of fetal hyperthermia, where the baby overheats. Two cases in Bristol in the early 1990s raised concern after both mothers had remained immersed for extended periods, and fetal hyperthermia was identified as a possible contributing factor in problems with the babies.9British Journal of Midwifery. Fetal hyperthermia risk from warm water immersion Neither baby was actually delivered in the water, but the incidents led to guidelines recommending that bath water during labor be kept at or below body temperature and that immersion times be monitored. The water needs to be warm enough to relax but not so hot that it raises the mother’s core temperature significantly.
When to Bathe a Newborn
Once the baby arrives, the question shifts from “how to prepare the water” to “when to use it.” Historically, newborns were bathed almost immediately after birth, often with the same boiled and cooled water that had been prepared for the delivery. Current evidence, however, favors waiting.
The World Health Organization recommends delaying a newborn’s first bath until at least 24 hours after birth, or at minimum 6 hours when a longer delay is not practical.10PubMed Central. Timing of first bath in term healthy newborns: A systematic review The reasoning is partly about temperature stability. Newborns lose heat rapidly, and a bath in the first hours of life can trigger hypothermia. But there are additional benefits to waiting. The waxy coating on a newborn’s skin, called vernix caseosa, acts as a natural moisturizer and barrier against bacteria. Washing it off immediately removes that protection. A pilot study from Lebanon found that delaying the first bath to 24 hours reduced hypothermia and vigorous crying, allowed the vernix to benefit the skin, and gave the mother more time for skin-to-skin contact and participation in her baby’s first bath.11PubMed Central. Newborn’s first bath: any preferred timing? A pilot study from Lebanon
Improved skin-to-skin contact in those early hours is associated with better breastfeeding rates, more stable body temperature, and healthier blood sugar levels in the newborn. So the old instinct to scrub the baby clean right away has given way to a more hands-off approach, at least in settings where the baby is healthy and born at term. When the first bath does happen, the water still needs to be clean and lukewarm, but the urgency has been deliberately pushed back.
Clean Water in Birth Settings Is Still Not Universal
In well-resourced hospitals, boiling water for birth sounds like a relic. But for a large portion of the world’s births, access to clean water remains a serious and sometimes fatal problem. A study of traditional birth homes in southwest Nigeria found that the majority operated under poor water, sanitation, and hygiene conditions, with none meeting the WHO’s minimum standards for environmental health.12PubMed Central. Water, sanitation, and hygiene (WASH) facilities and infection control/prevention practices in traditional birth homes in Southwest Nigeria
Even in hospitals across eight countries in East Asia and the Pacific, only about 77% had a sink with water and soap or alcohol-based hand rub available in delivery rooms. When the standard was tightened to include clean sinks with water, soap, and hand-drying methods, the figure dropped to 45% in delivery rooms and just 10% in postnatal care rooms. Appropriate hand hygiene was observed in only about two thirds of the deliveries that researchers watched.13PubMed Central. Status of water, sanitation and hygiene services for childbirth and newborn care in eight countries in East Asia and the Pacific Those numbers are sobering. If a hospital delivery room does not reliably have soap and running water, then the advice to “boil water” is not archaic. It is still the most practical step a birth attendant can take.
This is the gap between what high-income countries take for granted and what much of the world still navigates. The instructions to boil water endure in global health training programs, community health worker manuals, and WHO guidelines for home birth precisely because millions of births each year still happen in settings where the water supply is not safe. Boiling remains a life-saving intervention, not a historical curiosity.
Postpartum Recovery and Sitz Baths
Water’s role in childbirth does not end with the delivery. In the days and weeks that follow, warm water is a common tool for recovery, particularly for healing perineal wounds. Sitz baths, where the person sits in a shallow basin of warm water, have been used across cultures to promote blood flow and comfort in the perineal area after tearing or episiotomy. Some traditions add herbal preparations to the water. A study in Indonesia found that sitz baths prepared with betel leaf had a positive effect on perineal wound healing in postpartum mothers.14AIP Conference Proceedings. Sitz bath betel leaves (piper betle) technical on healing of postpartum women perineum wound
Whether or not herbal additives make a measurable difference, the warm water itself helps. It reduces swelling, relaxes the pelvic floor muscles, and keeps the wound area clean. In a home setting without access to a pharmacy full of antiseptic sprays and medicated pads, a basin of boiled and cooled water is a low-cost, low-risk recovery tool. The same logic that applied during delivery, using heat to make water clean and safe, applies equally in the postpartum period, when surgical-site infections and wound complications are a real concern.
The Hollywood Version Versus the Real Practice
The pop-culture image of boiling water during birth has become something of a joke, partly because the frantic request is never followed by an explanation. The scene usually serves as dramatic shorthand for “this baby is coming and nobody is ready.” That framing strips the practice of its context and makes it seem arbitrary or performative.
In reality, the request to boil water was shorthand for an entire protocol of infection control. It meant: sterilize the scissors, prepare clean rags, wash your hands, get warm compresses ready, and have safe water available for cleaning the mother and baby afterward. Each of those steps addressed a specific threat. The reason the instruction survived so long in popular memory is that it was genuinely universal. Regardless of culture, geography, or era, if you were attending a birth at home, you needed clean hot water for multiple purposes. No other single preparation covered as many bases.
The practice also had a psychological and practical side benefit that tends to get overlooked. Telling someone to boil water gave them something useful to do. Birth, especially at home, could involve hours of waiting during which anxious family members had little to contribute. Boiling water, maintaining the fire, preparing cloths, and keeping the supply of sterile materials ready gave bystanders a meaningful role in the process. It channeled nervous energy into a task that genuinely mattered for the safety of the mother and child.