Which Pregnancy Swaps Actually Matter? Ranked by research

Why rank pregnancy swaps at all?

Pregnancy is a time when people are told to worry about almost everything, and online "non-toxic" lists rarely say which changes matter. The Royal College of Obstetricians and Gynaecologists (RCOG) suggested a precautionary approach to everyday chemicals in 2013, but its own authors said that for most environmental chemicals "we do not know whether or not they really affect a baby's development", and that low-dose exposure "may pose minimal risk". Tommy's, the pregnancy charity, makes the same point: for many household chemicals only potential links have been found and other factors may be responsible.

So this page ranks swaps by two things: how good the evidence is, and how big your exposure is likely to be. We use our site labels: Strong, Promising, Early, and Mixed research.

What it claims

Popular "non-toxic pregnancy" advice usually claims that switching to clean beauty, filtered shower water, organic everything, glass storage and natural cleaning products will protect your baby from hormone-disrupting chemicals. Some of those swaps are sensible. The claim that they all matter equally is not supported.

What the evidence shows

Tier 1: do these (Strong evidence)

Smoking, alcohol, supplements and food. These are the changes with direct, consistent evidence of harm or benefit. Smoking restricts the baby's oxygen and raises the risk of stillbirth and low birth weight; second-hand smoke matters too. Folic acid before conception and in early pregnancy lowers the chance of neural tube defects. The NHS food rules exist because listeria, toxoplasmosis and mercury lead to real, measurable harm.

Lead. Lead is one of the few household "toxins" where the evidence is strong and the source is identifiable. UKHSA says homes built before 1970 may have lead pipes and that leaded paint is still found in older properties; exposure is mainly a risk when old paint is sanded or stripped. If that describes your home, this is the most important "environmental" swap on the list. Ask your water company for a lead test, run the kitchen tap in the morning, and keep away from any work on old paint.

Tier 2: sensible precautions (Promising)

Pesticides, solvents and paint. Tommy's advises avoiding household and garden pesticides, and using water-based paint with good ventilation. Modern water-based paint fumes are unlikely to cause harm, but there is no benefit in breathing them while pregnant. If you are planning a nursery, ask someone else to paint and air the room well. See our low-VOC paint guide.

Tier 3: low-cost, but uncertain (Early or Mixed research)

Fragrance. Phthalates are used in some fragrances and plastics. A pooled analysis of 16 US pregnancy cohorts found higher urinary phthalate levels were associated with a higher chance of preterm birth. This is observational data, which cannot prove that phthalates are the reason, and people's exposure comes from diet and packaging as well as cosmetics. Still, fragrance-free basics cost no more, so it is an easy swap. See our fragrance-free moisturiser guide.

Plastics and BPA. In 2023 the European Food Safety Authority cut its tolerable daily intake for BPA (bisphenol A) by around 20,000 times, but Germany's BfR disagreed and set a level 1,000 times higher. Regulators genuinely disagree. The practical step is cheap: do not microwave food in plastic, and use glass or steel for hot food. See plastic food storage: what matters.

Non-stick pans. PFAS (long-lasting "forever chemicals") have been associated with slightly lower birth weight, but most exposure comes from food and water rather than a modern PTFE pan used normally. Replace scratched or flaking pans when convenient rather than in a panic. Read is non-stick worth avoiding?.

Tier 4: probably not worth your money for pregnancy

• Shower filters. UK water companies keep chlorine low (usually at or below 0.5 mg/l, says the DWI). There is no evidence that filtering shower water changes pregnancy outcomes. Our shower filter guide covers what they do and do not do.
• Hair dye avoidance. The NHS says most research shows hair dye is fine in pregnancy; waiting until after 12 weeks and ventilating are optional extras.
• "Clean" or aluminium-free deodorant. No pregnancy evidence either way; see our aluminium deodorant explainer.
• Organic mattresses, EMF blockers, crystals. We found no pregnancy evidence to support them.

Who should be careful

• Anyone who works with solvents, pesticides, lead or other chemicals should speak to their employer and midwife; workplace exposures are much higher than household ones.
• Anyone renovating an older home: dust from old paint is a real lead risk.
• Anyone using prescription skin treatments, such as retinoid creams or tablets, should check with their GP or pharmacist before or as soon as they become pregnant.

If you want to act: what to look for

• Lead: a jug certified to NSF/ANSI 53 for lead as a stopgap, while you arrange a test.
• Paint: water-based, low-VOC, with someone else holding the brush.
• Basics: fragrance-free laundry and toiletries, and glass or steel for hot food.

Our picks at a glance

ZeroWater 5-Stage Water Filter Jug

Independently certified for lead reduction, so it fits the one water swap with a strong case. Caveat: cartridges run out quickly in hard water, and replacing lead pipes is the real fix.

COAT Flat Matt Paint

A low-VOC, water-based wall paint for nursery jobs. Caveat: its A+ emissions class is self-declared, and ventilation matters as much as the tin.

Bottom line

Put your energy into the NHS basics and, if you live in an older home, lead. Then make cheap swaps that also simplify your life, such as fragrance-free basics and not heating food in plastic. Most of the expensive "non-toxic pregnancy" products have little evidence behind them, and it is fine to skip them. Our non-toxic pregnancy checklist turns this into a step-by-step list.