Birch Oil in Pregnancy and Around Children: What Sources Say

Avoid birch oil during pregnancy and keep it away from children of every age. That is the shop's written position and that of the Tisserand and Young text. The evidence differs by group: for children it includes poison-center guidelines and documented deaths from small amounts of wintergreen oil, for pregnancy a hazard classification and extrapolation from aspirin.

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This is a sourced explainer by the shop that sells the oil. It is not individual medical advice, and no clinician has reviewed it. If you are pregnant or have a child, ask a pharmacist, physician, midwife or pediatrician about a specific exposure, and call a poison center (1-800-222-1222 in the United States) about a swallowed or spilled product.

Children: the margin is a lick

For a child under 6, the consensus guideline from American poison centers says that ingesting more than "a lick or taste" of oil of wintergreen, described as 98% methyl salicylate, warrants emergency-department referral; for anyone 6 or older the line is more than 4 mL (Chyka et al., 2007). Birch oil is not named in the guideline, but the sweet birch figure is 93.24-99.84% methyl salicylate (Dosoky et al., 2022), so we apply it. That is our extrapolation, and a conservative one.

The deaths and injuries behind the guideline are documented. A 2007 review of the literature and two decades of poison-center data found that a teaspoon (5 mL) or less of oil of wintergreen has been implicated in several well-documented deaths of children under 6 (Davis, 2007). A Great Ormond Street Hospital case report describes a child who developed laryngeal edema after accidental ingestion (Botma et al., 2001). A 1990 edition of Goodman and Gilman, quoted in the NIH hazardous substances database, says as little as 4 mL (4.7 g) of methyl salicylate may be fatal in children (PubChem).

Children are also more vulnerable for physiological reasons. Poison Control says children have thin skin and immature livers, which might make them more susceptible to toxic effects than adults (Poison Control). The Tisserand Institute's summary of Essential Oil Safety recommends not using wintergreen or sweet birch oils in children of any age (Tisserand Institute).

Law points the same way, with unusually small numbers. EU cosmetics law bars methyl salicylate in preparations for children under 6, except toothpaste (Regulation (EU) 2023/1545). A 2023 EU expert-committee opinion advised that products for children aged 6 months to 3 years be safe up to 0.02% in shower gel, hand soap, shampoo, body lotion and similar products (SCCS, 2023). That is scientific advice, not law, and its message is that regulators work in hundredths of a percent: it is not a green light for a homemade product at any strength.

Two further points. The U.S. Consumer Product Safety Commission requires child-resistant packaging for liquids containing more than 5% methyl salicylate by weight (16 CFR 1700.14), but "special packaging" means packaging that is significantly difficult for children under 5 to open (16 CFR 1700.1), which is not the same as child-proof. And MedlinePlus says "substances with oil of wintergreen" contain aspirin-like salicylates and should not be given to a child with a cold or fever, because of Reye syndrome, a rare illness that has occurred in children given aspirin during chickenpox or flu (MedlinePlus). FDA's required Reye warning covers oral and rectal aspirin and salicylate drugs, not external products (21 CFR 201.314). No FDA, CDC or AAP text in the sources reviewed says whether topical or inhaled methyl salicylate carries a Reye risk, so we cannot say it does or does not. See the piece on aspirin sensitivity for the related adult questions.

Pregnancy: what is documented and what is extrapolated

Four threads, with the evidence level labelled for each.

What we cannot tell you is whether burning a birch candle or running a diffuser exposes a pregnant person to anything measurable; none of the sources reviewed tests that. Our position is to skip both, and not to handle undiluted oil at all. If you work with it professionally, ask your obstetrician or midwife, and take the shop's published certificate and a lot reference with you so they know what the product is.

Breastfeeding

The shop's written guidance says not to use birch oil if breastfeeding. The sources reviewed include no lactation source that addresses birch oil or methyl salicylate: the MotherToBaby aspirin sheet says aspirin passes into breast milk and that the Reye risk has not been reported when a baby is exposed through breast milk, but it covers oral aspirin only and says nothing about topical products (MotherToBaby, 2025). Reasoning from the skin-absorption figure, we would not use it on the chest or near a nursing infant. Ask a lactation consultant, pharmacist or physician for anything more specific.

A storage checklist for homes with children

  1. Keep the oil locked away, not just high up: a locked box or cabinet, out of sight, with the closure tightened every time.
  2. Keep it in its original amber glass bottle. Never decant it into a drink bottle, a spray bottle you cannot lock up or any food container.
  3. Do not rely on the closure. Child-resistant packaging slows children down; it does not stop them.
  4. Treat finished products the same way. A reed diffuser liquid is an essential oil dissolved in isopropyl alcohol and must be kept out of the reach of children (Poison Control), and a scented lotion or soap contains the oil too.
  5. Do not measure, blend or pour while a child is in the room. Spills are the usual route to a mouth or a hand.
  6. Put 1-800-222-1222 in your phone and on the fridge before you open the bottle.
  7. Poison Control's general advice is that if you have young children, consider discarding essential oils; otherwise lock them up out of sight and reach of children and pets (Poison Control). Ask your poison center or local waste program how to dispose of one safely.

If a child has swallowed or tasted it

Poison Control says to call 911 immediately if the child collapses, has a seizure, has trouble breathing or cannot be awakened, and otherwise to use its online tool or call 1-800-222-1222, both free, confidential and available around the clock (Poison Control first-aid guidance). Do not induce vomiting; the consensus guideline says not to induce emesis for salicylate ingestions (Chyka et al., 2007). Poison Control's general rule for swallowed products is to give a small amount of water or milk only if the product is burning or irritating and the child is conscious and able to swallow; the poison center will tell you whether that applies.

Keep the bottle and note the time and the amount. For oil on skin, remove contaminated clothing and rinse with running water for at least 15 minutes; for the eyes, irrigate for 15 to 20 minutes. Do not wait for symptoms. The first-aid piece has the full sequence, and the safety guide and methyl salicylate explainer cover why the numbers are so small.

Common questions

Is birch oil safe during pregnancy?

We advise against it. The Tisserand Institute summary and the shop's written guidance both say avoid it, and the EU classifies pure methyl salicylate as suspected of damaging the unborn child. No study tests candles or diffusing, so ask your obstetrician or midwife about any exposure you are worried about.

Is birch oil safe for babies and children?

No. Tisserand and Young's text recommends against it at any age, EU cosmetics law bars methyl salicylate in products for children under 6 except toothpaste, and poison-center guidelines treat more than a lick by a child under 6 as an emergency. Keep the bottle locked away and out of sight.

What should I do if my child swallows birch oil?

Call Poison Help at 1-800-222-1222 or use the online tool right away, and call 911 if the child collapses, has a seizure, has trouble breathing or cannot be awakened. Do not induce vomiting. Keep the bottle, note the time and amount, and do not wait for symptoms before calling.

Can I diffuse birch oil around children?

We do not recommend it. None of the sources reviewed measures methyl salicylate exposure from diffusing, so the risk is unquantified rather than disproved. The measured hazard is the liquid: a tipped diffuser, spill or open bottle within a child's reach. If you diffuse anything, ask your pediatrician and keep the oil locked away.

The simple version is also the safe one: no birch oil in pregnancy, none for children, a locked box for the bottle, and the poison number in your phone before you need it.

Birch Essential Oil bottle

Birch Essential Oil

Birch Essential Oil from our own shop, in sizes from 1 oz to bulk.

From $15.99

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Sources & Further Reading