Two rules before anything else
First, essential oils are never taken by mouth in pregnancy. Ingestion is the route associated with serious toxicity, and there is no safe home dose. Second, skip essential oils entirely in the first trimester, when organ development is at its most sensitive and nausea makes strong scents unbearable anyway.
Generally considered safe from the second trimester
- Lavender — sleep and anxiety. The most studied oil in pregnancy and labour.
- Sweet orange and mandarin — mood and mild nausea. Phototoxic risk is low but keep treated skin out of the sun.
- Ginger — nausea, by inhalation.
- Frankincense — grounding, useful in labour breathing.
- Roman chamomile — calming, in low dilution.
- Peppermint — helpful for nausea by inhalation only; avoid on skin and avoid entirely if you are breastfeeding, as it can reduce supply.
Avoid throughout pregnancy
Clary sage, jasmine and rose otto are traditionally used to stimulate contractions and are avoided until you are in established labour and your caregiver agrees. Rosemary and sage can raise blood pressure. Basil, fennel, aniseed, clove, cinnamon bark, nutmeg, oregano, thyme, wintergreen, birch, camphor, juniper, pennyroyal and hyssop should all be avoided — variously for high ketone or phenol content, blood pressure effects, or a documented risk profile. Eucalyptus and strong camphor products should be kept away from newborns as well.
Correct dilution and use
For topical use in pregnancy, dilute to 1 percent: roughly 6 drops of essential oil in 30 ml of a carrier oil such as coconut, sesame or sweet almond. Never apply neat. Avoid the abdomen and broken or sensitised skin, and patch-test on the inner forearm for three evenings.
For inhalation, two drops on a tissue held a hand's width away, or two to three drops in a diffuser run for twenty to thirty minutes in a ventilated room, is plenty. Continuous all-night diffusing is unnecessary and commonly causes headaches. Avoid steam inhalation with oils, which delivers a far higher dose than intended. Hot baths are not advised in pregnancy, so skip bath oils in favour of a footbath.
Using aromatherapy in labour
Many hospitals permit a personal diffuser or a scented cloth. Lavender and frankincense pair well with slow breathing; peppermint on a tissue helps nausea in transition. Bring your own labelled bottle, check the hospital's policy in advance, and stop if the scent starts to irritate — scent preference changes sharply during labour.
When to stop and ask
Discontinue and speak to your doctor if you develop a rash, headache, dizziness, palpitations or contractions after use. If you have asthma, epilepsy, high blood pressure, a history of preterm labour, or you are carrying multiples, clear any aromatherapy plan with your obstetrician first.