How Plastics Affect Your Baby's First 1,000 Days

If you’re doing everything you can to give your baby or toddler the best possible start in life, then you’ll want to know about the effect of chemicals from plastics, on both you and your little one. A baby’s first 1,000 days (from conception to their second birthday) is a developmental window unlike any other, and what happens during this time shapes their health for life.

The brain, the nervous system, the immune system and the gut microbiome are all being built during this time. And all of these systems are far more sensitive to their surrounding environment than most of us realise. Emerging science is revealing just how exposure to plastics in early life can alter the course of a child’s development. Here’s what the research is saying and the information every parent deserves to understand.

Plastic-derived chemicals such as phthalates, BPA and microplastics are tiny plastic particles that have quietly made their way into our food, water, air and everyday products, and are now being detected in placentas, umbilical cord blood, newborn stools and even breast milk. And the evidence around what they may be doing to a developing baby’s biology is something we simply can’t ignore.

These microplastics are in your food packaging, your skincare products, as well as your baby’s bottles, nappies and mattress. And, over the past 20 years, global plastic production and plastic waste have doubled despite widespread awareness. High exposure to microplastics has been linked to developmental harm during early life, and it means we can no longer stick our heads in the sand about using them so frequently in our daily lives.

This blog walks you through what the current science tells us, where these exposures are actually coming from, and what practical steps you can take right now to reduce your baby’s and toddler’s burden during these critical early years.

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What the research shows

A landmark study published just recently in 2026 found that two phthalate chemicals (found in plastics) DEHP and DiNP were associated with nearly 2 million premature births and 74,000 newborn deaths worldwide in 2018 alone. This is very chilling data that stopped me in my tracks, especially as these are the plasticisers used to make everyday consumer products flexible and durable. Researchers now describe them as “everywhere chemicals.”

Phthalates are endocrine disruptors which means that they interfere with the body’s hormone signalling. In a developing baby, where hormones are orchestrating the growth of the brain, the nervous system, the reproductive organs and so forth, even small disruptions can have lasting consequences.

For instance, phthalate exposure can affect little boys’ testicular development such as shortened anogenital distance (the distance from the anus to the genitalia) which may affect their future fertility. Little girls exposed to phthalates might experience early puberty. Ther have also been links with thyroid problems. Living with a thyroid condition can lead to weight gain and fatigue.

Exposure to phthalates and bisphenols has been associated with a higher risk of allergic conditions and an increased risk of infantile eczema. If you’re a parent who’s spent months trying creams, cutting out foods and wondering why your baby’s skin just won’t settle, this is something to consider.

Microplastics have also been shown to affect the gut microbiome. The reasons are manifold, as these chemicals can reduce the diversity of beneficial gut bacteria, and increase the levels of harmful pathogenic bacteria. The gut lining can also be damaged leading to altered mucus secretion and impaired intestinal barrier function, in turn leading to increased inflammation. Microplastics can also increase intestinal permeability (also known as ‘leaky gut’), which may allow harmful substances to pass from the gut into the bloodstream, and can act as carriers for pathogens and other pollutants into the rest of the body.

Multiple independent research studies have identified the first trimester of pregnancy (the first three months) as a particularly sensitive window. This is when the placenta is forming and when the earliest architecture of your baby’s brain is being laid down. Phthalates can cross the placental barrier, and they disrupt thyroid hormone function, which is essential for foetal brain development.

Studies have linked early exposure to the chemicals within plastics to the likelihood of living with ADHD, Autism and other developmental differences as well as executive function difficulties, verbal comprehension and behavioural outcomes.

The good news is that most plastic-derived chemicals (except for PFAS) have a short half-life and they have the potential to leave the body within days. This means that every swap you make has a real and immediate effect and you are not trying to undo decades of accumulated exposure. You are reducing what is happening right now, and that matters enormously.

If you are pregnant or breastfeeding and keen to take the opportunity to reduce your plastic exposure before your baby is born, you can read my recent blog post, which shares some very helpful tips.

Six key microplastic exposures during the first 1,000 days

Understanding where plastic chemical exposure comes from is the first step to doing something about it for your baby or toddler. Here are the places where these chemicals lurk, that the research has identified as most significant exposures.

Feeding bottles

Standard polypropylene feeding bottles can release up to 16.2 million microplastic particles per litre when preparing formula. This is a figure that rises significantly when the bottles are sterilised with boiling water, which is standard practice for most families (and the safe way to prepare formula). A 2021 study by Health Canada found that all 20 baby bottle brands tested released both two chemicals found in plastic: Bisphenol A (BPA) and Bisphenol S (BPS) when used with water, breastmilk, formula or juice.

BPA was banned from baby bottles in Europe in 2011 and by the FDA in 2012. But when BPA was removed, manufacturers replaced it with the chemical substitutes BPS and Bisphenol F (BPF). Research published since has found these substitutes are structurally very similar to BPA and carry similar hormonal activity. This means the label therefore says BPA-free, but in reality, the endocrine risk is often still there.

Switch to glass feeding bottles where you can. I was recently speaking to the lead nurses at the Portland Hospital, and they were reminiscing over how they used to use pre-filled glass feeding bottles for their newborns. The Centre Hospitalier Angoulême in France and Great Ormond Street Hospital in London are both already committed to reducing plastic use in their infant care settings and are trialling glass feeding bottles. Glass releases no microplastics or bisphenol, and the bottles are made of hardened glass, so they far less likely to shatter when dropped.

Even better, if breastfeeding is possible for you, it removes this exposure pathway (but remember to avoid drinking from plastic water bottles and steer clear of other microplastic exposures yourself).

When they have started weaning onto solids, choose bamboo plates and bowls, as well as silicone spoons, and avoid plastic crockery and cutlery where you can. Find sippy cups and water bottles that are made from bamboo or stainless steel where possible.

Pacifiers or dummies

Many babies rely on pacifiers to settle themselves. A peer-reviewed study published again recently in 2026 tested a range of commercially available dummies and found that multiple products exceeded the European Food Safety Authority’s daily exposure limits for bisphenol compounds – and in some cases, by many thousands of times. One dummy labelled ‘BPA-free’ released more BPA than others in the test, so the BPA-free label is not a reliable safety guarantee.

Look for dummies and pacifiers made from natural rubber or medical-grade silicone instead. And if you have any doubt, contact the manufacturer directly and ask them for details about their products. This is the same for teething rings and other toys that they regularly chew or suck on or put in their mouth.

Nappies and baby wipes

Disposable nappies sit against your baby’s most sensitive skin for the entirety of the nappy-wearing years, often for two to three years of constant contact (and in some kids with developmental delays, this can be for many years after that). Most disposable nappies contain a range of synthetic materials, including plastics, absorbent gels and fragrance chemicals, many of which have not been comprehensively tested for safety in the context of prolonged skin contact in infants.

Fragranced baby wipes are a similar worry. Phthalates are commonly used as fragrance carriers to help keep personal care products smelling nice over time. They are often listed on the ingredient label simply as ‘fragrance’ or ‘parfum’ rather than by their chemical names. So switch to fragrance-free bamboo or regenerated cellulose wipes when you are out and about.

Cloth nappies are the most straightforward way to remove this daily exposure. They have come a long way in terms of practicality and are significantly kinder to the planet as well as to your baby’s skin. If disposables work better for your family, look for brands that are fragrance-free and plastic-free. This is not just for babies and toddlers, but also night nappies for older kids.

For wipes, cotton wool and warm water are all a newborn’s skin actually needs, and it is one of those cases where the simplest option is also the best one. For older kids, use cotton flannels to clean them up. This is what I did for my little ones!

Skincare and bath-time products

Your baby’s skin is more absorbent than adult skin, and in the early weeks and months, it is still developing its own barrier function. This means that what you put on it really matters.

Phthalates are used in fragrances, preservatives and emulsifiers in many conventional baby skincare and bathtime products, and they are almost never named individually on the label, so you must look out for a label saying phthalate-free instead.

Choose certified organic or natural skincare and bathtime products with short, readable ingredient lists if possible. There are now lots of wonderful natural bubble baths, shampoos, moisturisers and nappy creams to choose from. Look for certifications from organisations such as the Soil Association or COSMOS Organic as a reliable marker of quality. Ideally, choose these natural options for both mummy and baby to minimise exposure for both of you.

For very young babies, less is always more and warm water alone in their bath is enough for the first few weeks, with a simple organic oil for moisturising if needed. Maybe add one drop of organic essential oil if you like bathtime to smell lovely!

Toothbrushes have the potential to shed microplastics. Thankfully, more brands now claim to be BPA-free and you can now source toothbrushes with bamboo handles and they use BPA-free nylon bristles. Some are going even more natural, using plant-based materials from castor beans in the bristles.

Clothing and bedding

This is one that surprises many parents. Synthetic fabrics such as polyester, nylon and acrylic shed microfibres with every wash and every wear. These microfibres are a form of microplastic, and they accumulate in household dust, in the air and on skin.

A 2024 systematic review found that infants have the highest calculated indoor microplastic inhalation exposure among all age groups, with textile exposure being a key contributor. This is likely because they spend the majority of their time in close contact with clothing and bedding.

The solution is to invest in organic cotton wherever you can, particularly for items worn closest to the skin such as vests, sleepsuits, sheets and baby sleeping bags. When you do wash synthetic items, a microfibre-catching laundry bag reduces what ends up in the water and ultimately in the air.

Cot mattresses

This is the exposure most parents have never considered, and it is so easy to just order a mattress online that fits your cot without really thinking beyond that.

Your baby sleeps 12 to 16 hours a day on their cot mattress. A 2025 study found that children’s mattresses release multiple toxic chemicals during use, including phthalates, flame retardants and plasticisers linked to endocrine disruption and neurotoxicity. The rate of chemical release increases with your baby’s body warmth, weight and movement, which means exposure is highest during sleep.

PVC mattress covers are also a problem and are used as a waterproofing layer on many conventional cot mattresses. PVC is softened with phthalates, which off-gas into the air and transfer to skin throughout sleep. Polyurethane foam emits volatile organic compounds and polyester sheets and blankets shed microfibres.

Look for a GOTS-certified organic cot mattress with a natural waterproofing layer and wool works excellently, as does a thin TPU layer over organic cotton. Avoid PVC or vinyl covers and choose organic cotton sheets and cellular blankets rather than polyester fleece if you can. It is one of the more significant investments you can make in your baby’s sleep environment, and in my view, one of the most worthwhile. If possible, also choose a natural mattress and cotton sheets/duvets when they switch to their toddler bed.

Round up

The first 1,000 days are the most vital developmental window for your little one. Their brain, nervous system and immune system are forming rapidly and are sensitive to environmental exposures in ways that have long-term consequences. Plastic-derived chemicals such as phthalates, BPA and microplastics are now found in placental tissue, umbilical cord blood, breast milk and newborn stool. The research linking these chemicals to premature birth, neurodevelopmental differences and hormonal disruption is substantial and growing.

The six key exposure pathways to address are feeding bottles, dummies, nappies and wipes, skincare and bathtime products, clothing and bedding and finally cot mattresses. Thankfully, every swap you make has a real and immediate effect, so start with one thing and build from there.

I know how overwhelming this information can feel when you are already navigating new parenthood, and many families are on tight budgets these days, so they cannot do it all. And the most important thing to know is that you do not need to do everything at once, and you certainly do not need to replace every item in your home! And the benefit of each swap you make is felt quite quickly.

If you have concerns about your exposure or your little one’s exposure to BPA, phthalates and forever chemicals, our clinical team can run urine tests to learn whether this is a problem or not for them and to track your child’s levels of this chemical exposure. We can also run these tests during pre-conception and pregnancy for expectant mothers if you are keen to work on this sooner rather than later.

For personalised guidance on reducing your family’s plastic chemical exposure during the first 1,000 days and lab testing, get in touch with our NatureDoc clinical team. We are here to help you build a practical, evidence-based plan that works for your family’s life.

Ask me what supplements can help… or anything else!

Plastic-free babies – what every parent needs to know about the first 1,000 days