How the Birth Environment Influences Stress, Hormones, and the Labor Experience

By Birth & Baby University · Last updated: October 2026 · 3 min read

Dim lights, privacy, a quiet room: these are staples of doula advice, often tied to claims about stress hormones. Some of the evidence is encouraging, but much of it is observational, and one setting-comparison review warns that the effect of the room is hard to separate from the way care is organized. This article lays out what is known.

Key takeaways

• A Cochrane review of 10 trials found that care in alternative, home-like institutional settings was associated with fewer interventions and more positive views of care, without evident harm.
• That review cautions that setting features were confounded with staffing and continuity, so the effect of the physical room alone cannot be isolated.
• A systematic review of birthing room design found positive themes (comfort, familiarity, warmth, less technocratic feel) but described the evidence as incomplete.
• Studies linking anxiety and stress hormones to labor are observational and some are decades old. They show associations, not proof that changing the room changes the hormones.

What the research says

Alternative birth rooms and settings

The Cochrane review of alternative versus conventional institutional settings included ten trials with 11,795 women. Allocation to an alternative, home-like setting increased the likelihood of no intrapartum analgesia (RR 1.18, 95% CI 1.05 to 1.33), spontaneous vaginal birth (RR 1.03, 95% CI 1.01 to 1.05) and very positive views of care (RR 1.96, 95% CI 1.78 to 2.15). It decreased epidural use (RR 0.80), oxytocin augmentation (RR 0.77), instrumental birth (RR 0.89) and episiotomy (RR 0.83), with no apparent effect on other adverse maternal or neonatal outcomes. The review found no trials of freestanding birth centers. It stressed that in several trials design features were confounded with organizational differences such as separate staff and more continuity, so independent effects of the physical environment are difficult to infer.

Room design

A systematic review of birthing room design screened 3,373 records and analyzed 15 articles from six countries. It identified four themes associated with better maternal and newborn physical and emotional outcomes: means of distraction, comfort and relaxation; raising the room temperature; features of familiarity; and diminishing a technocratic environment. The authors concluded that evidence on how birthing environments affect outcomes is incomplete and that more research is needed.

Stress, hormones and labor

A 1985 study of 50 multiparous women found that labor duration in early active labor was significantly related to plasma epinephrine and norepinephrine measured at the start of the phase, and that epinephrine was related to observed stress and self-reported anxiety. The authors concluded that anxiety and epinephrine are related to labor duration and fetal wellbeing. This is an association in a small, older sample. A more recent oxytocin review reports that sympathetic activation lowers oxytocin release and that social support is linked with release, again without establishing that environmental changes alter outcomes.

What this means for doulas

• Say what the research supports. Familiar, comfortable, less clinical rooms are associated with more positive experiences and fewer interventions in some settings. It is a matter of association and organizational context.
• Do not promise physiological results. Avoid “your adrenaline will stall labor” or “a calm room will speed it up.” Neither is established.
• Work within the setting. Many births take place in rooms you cannot redesign. Small changes, such as lighting, a familiar object, privacy and fewer interruptions, are worth asking the team about.
• Respect safety needs. Monitoring, access and emergency readiness may constrain the room.

Putting the evidence into practice

• Create a short checklist for clients: lighting, sound, temperature, familiar items, who comes in and when, and how to ask for fewer interruptions.
• Ask the nurse or midwife which changes are acceptable and explain the reason to the client, such as monitoring needs.
• If your client is anxious, address the anxiety directly with information, reassurance and options rather than focusing on stress hormones.
• Choose language like “many people find” over claims about hormones.

The bottom line

A calm, familiar environment is a reasonable aim and is associated with better experiences, but the research does not prove that the room itself changes physiology or outcomes. Doulas can improve comfort and agency while leaving hormonal claims modest.

This article is for professional education. It is not medical, legal or tax advice. Check the standards of your certifying organization and the rules where you work.

Sources and further reading

• Hodnett ED, et al. Alternative versus conventional institutional settings for birth. Cochrane Database of Systematic Reviews 2012. Read the source
• Nilsson C, et al. Effects of Birthing Room Design on Maternal and Neonate Outcomes: A Systematic Review. HERD 2020. Read the source
• Lederman RP, et al. Anxiety and epinephrine in multiparous women in labor: relationship to duration of labor and fetal heart rate pattern. American Journal of Obstetrics and Gynecology 1985. Read the source
• Uvnas-Moberg K, et al. The physiology and pharmacology of oxytocin in labor and in the peripartum period. American Journal of Obstetrics and Gynecology 2024. Read the source

Creating a supportive birth environment is part of the practical skills taught in doula training. See the options on the For Doulas page.

More for professionals: the Professionals Blog.