Last week we covered the household chemicals that affect fertility and conception. This week we follow the same line of evidence into the first five years of a child's life. Many of the same chemicals matter (phthalates, PFAS, indoor air pollution), but the framework changes. The question is no longer how to protect a pregnancy that has not yet happened. It is how to lower the baseline chemical exposure during the years when a child's brain and body are forming in real time. This week's Deep Dive walks through the five categories that matter most.
But first, we filtered the noise — here's what's worth knowing this week.
THE FILTER
Nature Made prenatal vitamins named in class action over plastic chemicals
Pharmavite LLC, the maker of Nature Made supplements, is facing a federal class action lawsuit filed in April 2025 alleging that its Prenatal Multivitamin Folic Acid + DHA Softgels contain unsafe levels of plastic-derived chemicals. The complaint cites third-party testing, which reported finding multiple phthalates and bisphenol A (BPA) in the supplements, including di-2-ethylhexyl phthalate (DEHP), a chemical the EPA classifies as a probable human carcinogen. For couples in active preconception or pregnancy, this is another reminder that the supplement industry's regulatory gaps put the responsibility on the consumer. Look for prenatal vitamins from brands with NSF Certified for Sport, USP Verified, or Informed Choice certifications. — ClassAction.org, Lang et al. v. Pharmavite LLC complaint, 2025.
A kimchi probiotic removed nanoplastics in a lab study, with real-world caveats
A February 2026 study published in Bioresource Technology by researchers at the World Institute of Kimchi in South Korea identified a specific bacterium found in kimchi, Leuconostoc mesenteroides strain CBA3656, that bound to polystyrene nanoplastics with 87 percent efficiency in lab conditions. When tested in conditions designed to mimic the human intestine, removal dropped to 57 percent, still meaningfully higher than the reference strain tested alongside it. A few caveats are worth knowing. The study tested polystyrene nanoplastics specifically, not the full range of plastics humans encounter. The 87 percent figure came from controlled lab conditions, not human guts. And the research institution is a Korean government-funded body with a clear mandate to promote kimchi globally, which is worth flagging on a study that conveniently elevates kimchi as a health intervention. The honest takeaway: the science is preliminary but encouraging. Eating fermented foods including kimchi, sauerkraut, kefir, and yogurt has well-documented benefits for gut health. If a specific bacterial strain in those foods also helps clear nanoplastics, that is a meaningful bonus. — World Institute of Kimchi, EurekAlert press release, 2026.
The FDA approved the first new sunscreen ingredient in over 20 years
On June 9, 2026, the FDA added bemotrizinol (known as BEMT) to the list of approved active ingredients in over-the-counter sunscreens, the first new approval since the late 1990s. BEMT has been used in Europe, Japan, and South Korea for more than 25 years. It is a chemical UV filter that provides broad-spectrum protection against both UVA and UVB rays, is not easily absorbed into the skin, and is significantly more photostable than avobenzone, the most commonly used chemical UVA filter currently on the US market. The Environmental Working Group, which historically has been cautious about chemical sunscreen filters, called BEMT a meaningful upgrade with "the most robust safety data on any UV filter to date." For Americans who have struggled with mineral sunscreens because of the white cast they leave on skin, this opens up real options. Products containing BEMT will take time to reach US shelves due to product development and reformulation timelines. The proprietary BEMT formulation is sold under the trade name Parsol Shield, and the ingredient may also appear on labels as "bis-ethylhexyloxyphenol methoxyphenyl triazine." Worth watching for over the next several months. — FDA, FDA Expands Sunscreen Options for the First Time in 20 Years, 2026.
DEEP DIVE
What the First Five Years Demand from the Home Environment
Children are not small adults. They breathe more air per pound of body weight, drink more water per pound of body weight, and eat more food per pound of body weight than adults do. Their bodies aren't yet equipped to process and eliminate toxins the way adult bodies are. Most importantly, their brains are developing. Specific neural structures form on specific timelines that, once passed, do not come back.
This is why the same exposure impacts a 2-year old differently than it impacts you. Lead exposure at age 2 produces measurable, lasting effects on intelligence, behavior, and learning that lead exposure at age 22 simply does not. The same is true across most of the categories covered below.
Most parents preparing for a new baby hear the standard guidance: safe sleep practices, car seat installation, vaccines, pediatrician selection. Few hear about the household chemical exposures that compound across the years their child's brain is most plastic. This issue covers the five categories worth the most attention.
Before we begin, it’s important to note that reducing exposures is not about reaching zero. It is about lowering the baseline burden during the years when the body is most susceptible. The highest-leverage actions are concentrated and a handful of decisions can cover most of the addressable load.
1. Lead
The most well-established category in this whole space, with evidence that is decades deep. The CDC's reference value of 3.5 µg/dL is not a safety threshold. It is the level at which a child has more lead in their blood than 97.5 percent of US children, which triggers follow-up. The science is clearer than that: no safe level of lead in children has been identified, and measurable effects on intelligence, attention, and behavior have been documented at blood lead concentrations well below 5 µg/dL. [1]
The major sources in modern US homes:
Pre-1978 paint. The federal ban on lead in residential paint took effect in 1978, but homes built before then often still have layers of leaded paint underneath subsequent repaints. Window sills, door frames, and exterior trim are the highest-risk surfaces because friction creates lead dust. About 24 million US housing units still have lead-based paint hazards.
Drinking water. Lead service lines and lead solder in plumbing (banned in 1986, still present in older homes) can leach into water. The Flint crisis brought this into public awareness, but the problem is widespread in older infrastructure across the country.
Imported toys and jewelry. Particularly inexpensive metal jewelry sold for children. The CPSC has recalled hundreds of products over the years for lead content.
Antique furniture, heirloom ceramics, certain pottery, and traditional cosmetics. Less common but worth knowing about. Vintage painted furniture is a known source.
Soil near older homes or busy roads. Legacy lead from leaded gasoline (phased out by 1996) persists in soil for decades.
What to do:
If you live in a pre-1978 home, get a lead inspection from a certified professional before doing any renovation work. Disturbing leaded paint without containment is one of the highest-exposure events possible.
Test your water for lead. SimpleLab's Tap Score is the most rigorous option and covers PFAS, lead, and other contaminants in one panel.
Follow the American Academy of Pediatrics (AAP) recommendation for blood lead screening at ages 1 and 2.
Wash hands frequently, especially before meals. Damp-mop and damp-dust regularly. Remove shoes at the door. These reduce ongoing exposure to lead-contaminated dust.
2. The Sleep Environment
Children spend more time in their sleep environment than anywhere else during the years their brains are developing. Infants sleep 14 to 17 hours per day. Toddlers sleep 11 to 14 hours. The materials they breathe against during those hours matter more than most parents realize.
An April 2025 study from the University of Toronto measured chemical concentrations in 25 children's bedrooms (ages 6 months to 4 years) and found concerning levels of phthalates, UV filters, and other plasticizers in the air, with the highest concentrations near the beds.[2] A companion study tested 16 new children's mattresses and confirmed that warmth and the pressure of a child's body weight significantly amplified off-gassing, with measurable increases in phthalates and a banned flame retardant called TCEP.
The categories of concern in the sleep environment:
Polyurethane foam mattresses. Release more total VOCs than polyester foam. New mattresses release approximately four times more VOCs than older mattresses, with emissions peaking in the first few weeks.
Vinyl waterproof mattress covers. Vinyl is a major source of phthalate off-gassing. Phthalates are not chemically bonded to vinyl, which means they migrate out continuously over the life of the product.
Synthetic fabric bedding and pajamas treated with stain-resistant or wrinkle-resistant finishes. These often contain PFAS or formaldehyde-releasing chemicals.
What to do:
Choose a crib mattress with GREENGUARD Gold certification (verifies low VOC emissions) and ideally MADE SAFE certification (screens against 6,500 harmful substances). Naturepedic is the most consistently recommended brand at the intersection of these standards, with organic cotton and natural rubber construction. My Green Mattress is a lower-priced alternative with similar certifications.
Avoid vinyl mattress covers. Choose organic cotton or wool covers instead.
Air out new mattresses for at least two weeks before introducing to the nursery. If the room can be ventilated continuously during that period, do so.
Wash all new bedding and pajamas before first use. Choose organic cotton that’s GOTS certified (Global Organic Textile Standard) when possible, particularly for items in direct contact with skin for hours per day.
3. PFAS in Drinking Water and Infant Formula
The PFAS conversation that applied to fertility in last week’s issue applies even more directly to infants and toddlers. A baby drinking formula made with contaminated tap water is getting a much higher dose per pound of body weight than any adult drinking from the same tap.
The American Academy of Pediatrics has explicit guidance for families in known PFAS-contaminated areas: use PFAS-free bottled water or filtered water rated for PFAS removal when reconstituting infant formula.[3] A 2022 USGS study found PFAS detectable in roughly 45 percent of US tap water samples.[4]
The exposure pathways for young children:
Tap water, particularly for formula reconstitution
Breast milk. PFAS from the mother end up in breast milk. This is not a reason to stop breastfeeding (the benefits clearly outweigh the exposure), but it is a reason for breastfeeding mothers to minimize their own PFAS exposure.
Household dust. Particularly relevant for crawling and toddling children with frequent hand-to-mouth behavior.
Children's products with stain-resistant treatments. Carpet, upholstered furniture, certain clothing.
What to do:
Install a water filter rated for PFAS removal. Reverse osmosis (AquaTru, Waterdrop) is the gold standard. For pitcher-based filtration, Epic Water is independently tested to remove up to 99.9 percent of PFAS and is what I personally use (code WELLNESSBREW15 for 15% off).
Avoid stain-resistant treatments on carpet, furniture, and clothing.
Damp-mop frequently to control household dust accumulation.
4. Flame Retardants
California's TB117 standard from 1975 to 2013 led to the widespread use of brominated and chlorinated flame retardants in upholstered furniture, car seats, mattresses, electronics, and many children's products. The chemicals did slow fires — but they also built up in household dust, in human tissue, and in children's bodies. By 2013, the standard was revised (TB117-2013) to allow manufacturers to meet flame resistance through design changes rather than chemical additives. Many products manufactured since 2015 carry a TB117-2013 label indicating no added chemical flame retardants are required.
The evidence base on developmental effects is substantial. The Herbstman 2010 study in Environmental Health Perspectives followed 210 children prenatally exposed to PBDE flame retardants and found measurably lower IQ scores at ages 1 through 6.[5] Subsequent studies have linked PBDE exposure to attention problems, hyperactivity, and reduced motor coordination in children.
The challenge is that flame retardants persist. Furniture purchased before 2014 likely contains them. They migrate into household dust over years and continue to expose children long after the original product was manufactured.
What to do:
When buying new upholstered furniture for the nursery or kids' rooms, look for the TB117-2013 label that indicates compliance without added chemical flame retardants. Most major retailers (IKEA, West Elm, Crate & Kids, Pottery Barn Kids) have shifted their product lines toward this standard, though it is still worth verifying per item.
Air out new furniture outdoors or in a separate well-ventilated room for at least one to two weeks before introducing it to spaces where children spend significant time.
Damp-mop and damp-dust frequently. This is the single most effective ongoing mitigation for flame retardant exposure in homes with older furniture. Dry sweeping or dry dusting redistributes the dust into the air.
Wash hands before meals, particularly for crawling and toddling children. The hand-to-mouth pathway is how flame retardants in dust end up in the body.
5. Indoor Air Quality
Children breathe more air per pound of body weight than adults do, which means they are disproportionately affected by indoor air pollution. The EPA estimates that indoor air can be two to five times more polluted than outdoor air in many homes.
The biggest indoor sources for families with young children:
Gas stoves. Cooking with gas produces nitrogen dioxide, carbon monoxide, and fine particulate matter. A 2022 study estimated that 12.7 percent of childhood asthma cases in the US can be attributed to gas stove exposure.[6] The NO2 concentrations during cooking routinely exceed EPA outdoor limits in unventilated kitchens.
Synthetic fragrance. Plug-in air fresheners, scented candles (particularly paraffin), and fragranced cleaning products release a continuous stream of volatile organic compounds. The 2025 University of Toronto study referenced in the sleep section also found significant UV filter contamination in children's bedrooms, much of which traces back to fragranced personal care products.
Combustion sources. Wood-burning fireplaces, smoking inside the home, and outdoor air pollution that gets inside — wildfire smoke, traffic exhaust, industrial emissions — especially in areas with poor air quality.
What to do:
Use a range hood vented outdoors every time you cook, especially with a gas stove. Recirculating hoods that filter and return air to the kitchen do not solve the problem.
Install a HEPA air purifier in the bedroom and the main living area. Blueair and AirDoctor are great options. Levoit is a strong budget alternative. Size the unit to roughly two-thirds of the room's square footage for adequate clean air delivery.
Eliminate plug-in air fresheners and synthetic-fragrance candles from the home entirely. Choose unscented or essential-oil-only alternatives if you want ambient scent.
Open windows for cross-ventilation when weather allows, even briefly. Air exchange dilutes accumulated indoor pollutants meaningfully.
The Five Years That Compound
A brief recap of where the priorities land by age:
Pregnancy through six months: Sleep environment is the highest leverage. The mattress and the materials in the nursery are what your child breathes against for thousands of hours during the most plastic developmental window of their life. Get this right.
Six months to two years: Lead screening becomes important as crawling and hand-to-mouth behaviors increase exposure to dust. Continue attention to water filtration and sleep environment. Damp-mopping becomes part of the routine.
Two to five years: Indoor air quality and ongoing dust management. Continue water filtration. Begin to be selective about plastic exposure and personal care products as your child becomes more autonomous in eating and bathing.
The decisions made in these years compound. Lead exposure at age two cannot be undone. The crib mattress used for the first two years is breathed against for thousands of hours of brain development. None of this is about achieving zero. It is about lowering the baseline during the window when the body is most susceptible.
ACTIONABLE TAKEAWAYS
Four things you can do this week:
1. Get the sleep environment right before the baby arrives. The crib mattress is what your child will breathe against for thousands of hours during the biggest developmental window of their life. Choose a mattress with GREENGUARD Gold and ideally MADE SAFE certification. Naturepedic is the most consistently recommended brand at this intersection of standards. Avoid vinyl waterproof mattress covers. Air out new mattresses for at least two weeks before bringing them into the nursery, with continuous ventilation during that period if possible.
2. Test for lead and filter your drinking water. Follow the AAP recommendation for blood lead screening at ages 1 and 2. If you live in a pre-1978 home, get a professional lead inspection before any renovation. Filter your tap water for PFAS and lead, with priority on the water used to reconstitute formula. Epic Water for pitcher filtration and AquaTru or Waterdrop for reverse osmosis.
3. Address indoor air quality. Use a range hood vented outdoors every time you cook with gas. Install a HEPA air purifier in the bedroom and the main living area. Blueair and AirDoctor are recommended options. Eliminate plug-in air fresheners and synthetic-fragrance candles from the home entirely. Open windows for cross-ventilation when weather allows.
4. Be selective about new furniture and household textiles, and damp-mop everything else. When buying new upholstered furniture for the nursery or kids' rooms, look for TB117-2013 labels indicating no added chemical flame retardants. Air out new items for one to two weeks before introducing them. For older furniture that may still contain flame retardants, frequent damp-mopping and damp-dusting is the most effective ongoing mitigation. Dry sweeping redistributes dust rather than removing it.
For a personalized assessment of your specific home, The Wellness Brew Home Detox goes deeper and leaves you with a prioritized action plan across all the categories of your household.
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Sources:
Centers for Disease Control and Prevention. CDC Updates Blood Lead Reference Value. CDC Childhood Lead Poisoning Prevention Program, 2021 (last updated 2024). Link
Vaezafshar S, et al. Young Children's Exposure to Chemicals of Concern in Their Sleeping Environment: An In-Home Study. Environmental Science & Technology Letters, 2025. Link
American Academy of Pediatrics. Perfluoroalkyl and Polyfluoroalkyl Substances (PFAS). AAP Council on Environmental Health and Climate Change, 2024. Link
Smalling KL, et al. Per- and polyfluoroalkyl substances (PFAS) in United States tapwater: Comparison of underserved private-well and public-supply exposures and associated health implications. Environment International, 2023. Link
Herbstman JB, et al. Prenatal Exposure to PBDEs and Neurodevelopment. Environmental Health Perspectives, 2010. Link
Gruenwald T, et al. Population Attributable Fraction of Gas Stoves and Childhood Asthma in the United States. International Journal of Environmental Research and Public Health, 2022. Link
Disclaimer: The Wellness Brew is for informational purposes only and does not constitute medical advice. The content published here is not intended to diagnose, treat, cure, or prevent any disease or health condition. Always consult a qualified healthcare professional before making any changes to your diet, supplement routine, or lifestyle.