In a week when the scientific community gathered in Chicago, researchers reported that the most trusted substance in infant nutrition carries traces of a quieter inheritance: endocrine-disrupting chemicals that move through the body and show up in breast milk and in the urine of babies. The work, presented at ENDO 2026, follows 336 mother-infant pairs over the first six months of life and suggests that the chemicals of ordinary modern living, from food packaging to personal care products, find their way into the earliest days of human growth. The findings do not yet tell us what these traces w
Endocrine Disruptors Found in Breast Milk and Infant Urine, New Study Reports
Infants showed measurable exposure to endocrine disruptors through breast milk and urine, with exposure linked to possible neurodevelopmental effects, hormonal changes and altered growth or obesity risk.
Damage may only become evident after many years
Mark
Why does this study land differently from other chemical-exposure findings?
Mimi
Because it involves breast milk, which most parents regard as the safest thing they can offer. Street's point is that it must be protected precisely because contaminants travel through it.
Mark
What stood out most in the numbers?
Mimi
Phthalates. They were in about 90 percent of milk samples at one month, and urine detection rose from 30.3 percent at birth to 79.4 percent at six months.
Luke
Detection isn't the same as harm, though. Do we know the concentrations?
Mimi
The reporting gives percentages of samples with traces, not levels, so that's a real gap.
Mark
And the health links?
Mimi
Neurodevelopmental issues, hormonal activation at birth, androgenisation, and altered growth and obesity risk.
Luke
Those are described as exposure being linked to them. The article doesn't show this study proving any of it in these infants, and Street says damage can take years to appear.
Mark
Where did the chemicals come from?
Mimi
Mostly diet and personal and household care products, according to the researchers.
Luke
Worth remembering this was presented at a conference, so I'd want to see the published paper before leaning hard on any single figure.
El Pulso
- Bisphenol A turns up in roughly half of breast milk samples, a finding that unsettles the assumption that milk is a clean and protected gift.
- Phthalates appear in nearly ninety percent of milk samples at one month, despite products that promise to be phthalate-free.
- Infant urine levels of BPA, BPS and phthalates climb steadily across six months, tracking what mothers eat and what enters the home.
- Researchers link the exposures to possible neurodevelopmental effects, early hormonal activation and altered growth, while long-term outcomes remain unconfirmed.
- Experts urge protecting breast milk rather than abandoning it, and the scientific community now awaits full publication to test these links.
In a week when the scientific community gathered in Chicago, researchers reported that the most trusted substance in infant nutrition carries traces of a quieter inheritance: endocrine-disrupting chemicals that move through the body and show up in breast milk and in the urine of babies. The work, presented at ENDO 2026, follows 336 mother-infant pairs over the first six months of life and suggests that the chemicals of ordinary modern living, from food packaging to personal care products, find their way into the earliest days of human growth. The findings do not yet tell us what these traces will mean across a lifetime, but they invite a careful reckoning with how small exposures in fragile beginnings may echo forward.
On Saturday, 13 June, researchers at ENDO 2026 in Chicago presented work that complicates one of the most trusted images in infant care. Endocrine-disrupting chemicals, they reported, are present in breast milk and in the urine of babies up to six months old.
The study followed 336 mother-infant pairs in the LIFE-MILCH project, collecting samples at one, three and six months after birth and testing for more than fifty compounds, including bisphenols, phthalates, parabens, pesticides and hydrocarbons. BPA was the most common chemical in milk, found in about half of samples, and its presence in infant urine rose to two-thirds by six months. Phthalates were the most widespread of all, appearing in most milk samples and in a rising share of infant urine, even though many products claim to be phthalate-free.
Most of these chemicals were linked to diet and to personal and household care products, suggesting that exposure travels from everyday life into the mother and onward to the child. Exposure was associated with neurodevelopmental problems, early hormonal changes and altered growth or obesity risk. Maria Elisabeth Street of the University of Parma stressed that breast milk remains the optimal nutrition for any child, and that the lesson is to protect it. Infancy is a sensitive window, she noted, and harm may only surface years later.
For now, these results come from a conference presentation, and they do not settle what the detection rates mean for long-term health. The next step is the publication of the full data, which will show whether early exposure truly connects to later outcomes.
On Saturday, 13 June, researchers at ENDO 2026, the Endocrine Society's annual meeting in Chicago, presented findings that complicate the most trusted image in infant nutrition. Endocrine-disrupting chemicals, they reported, turned up in breast milk, and in the urine of babies up to six months old.
The work draws on 336 mother-infant pairs enrolled in the LIFE-MILCH project. Samples were collected at several points: one month, three months and six months after birth. The team measured exposure to more than 50 chemicals, spanning bisphenols such as BPA, polycyclic aromatic hydrocarbons, phthalates and their metabolites, parabens, polar pesticides and pyrethroids.
BPA was the most commonly detected compound in milk. It appeared in 51.2 percent of samples at one month and 49.8 percent at six months. In infant urine, it was found in nearly a third of babies after birth, rising to 67.6 percent by six months. Bisphenol S, a related compound, showed up in 10.7 percent of milk samples at one month and 18.3 percent at six months. In urine it was present in 22.4 percent of infants at birth and 41.2 percent at six months.
Phthalates were the most widespread. Including dibutyl phthalate, they were found in 90.2 percent of milk samples one month after birth and 86.5 percent at six months. In urine, detection climbed from 30.3 percent at birth to 79.4 percent at six months. That is notable given that many products now advertise themselves as phthalate-free, a claim the milk and urine samples did not appear to bear out.
Parabens followed a similar pattern. Methylparaben and ethylparaben were most often found in milk at one month (51.2 and 42.3 percent) and at six months (56.2 and 52.6 percent), and their presence in urine increased over time. The pesticide glufosinate was found in milk at one month (27.4 percent) and three months (31.9 percent), and in urine at birth (44.7 percent) and six months (38.2 percent). Most polycyclic aromatic hydrocarbons were rarely seen in milk, though several were consistently found in urine, in up to 27.7 percent of samples.
The researchers also looked at how these chemicals might be reaching mothers and, through them, infants. Most of the compounds found in milk and urine were tied to dietary habits and to personal and household care products. Exposure was associated with neurodevelopmental problems, hormonal activation at birth and androgenisation, meaning the development of male reproductive characteristics. Maria Elisabeth Street, who directs paediatric endocrinology at the University of Parma and University Hospital of Parma in Italy, added that exposure can also alter growth, weight and obesity risk.
Street framed the finding as a reason to protect breast milk, not to avoid it. She called it the optimal nutritional source for any child, but one that serves as a vehicle for environmental contaminants. Infancy, she said, is a critical window because effects are magnified at this age, and damage may only become evident after many years.
The results were presented at a conference, and the reporting does not settle what these detection rates mean for long-term outcomes. What to watch is whether the full data are published and whether they clarify the link between early exposure and later health.
Citas Notables
Breast milk is the optimal nutritional source for any child and must be protected, as it is a vehicle of environmental contaminants.— Maria Elisabeth Street, University of Parma
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