Infants face potential dietary exposure to plastic-derived contaminants like nanoplastics and oligomers that is at least an order of magnitude higher than that of adults, according to a systematic review published in the journal NPJ Science of Food. Smaller body sizes, higher food intake per kilogram of body weight, and frequent reliance on plastic-based feeding products significantly increase this exposure, though current regulatory measures provide limited coverage and lack infant-specific limits.
Systematic Review Evaluates Infant Exposure to Nanoplastics and Oligomers
Researchers evaluated evidence on infant dietary exposure to plastic-derived contaminants to assess the current state of research in the field. According to the study, economic and practical barriers limit the adoption of non-plastic alternatives for families. Such deficiencies underscore the urgent requirement for targeted risk assessment and systematic research to inform the development of effective mitigation strategies for this vulnerable population.
The study’s inclusion criteria required primary studies to report new quantitative data on micro- and nano-plastics (MNPs) or oligomer concentrations, or release rates in infant food or feeding equipment. Literature reviews were eligible provided they included sections dealing with plastic-derived contaminants originating from or present in infant equipment and food. Studies lacking migration experiments, quantitative data, or clear distinctions between plastic and non-plastic oligomers were excluded from the analysis.
Did you know?
According to the systematic review findings, airborne deposition during formula preparation was found to be 1.7 times the inherent microplastic concentration present in the formula itself.
Methodological Gaps and Variations in Contaminant Research
Methodological quality was evaluated using 14 core criteria addressing sample preparation, contamination mitigation, and experimental design. Adjustments were made for differing properties of particulate MNPs versus dissolved oligomers, as well as food matrices versus container simulants. Because variations in sampling, analysis, and reporting prevented a meta-analysis, the authors used a qualitative synthesis rather than calculating a single average contamination rate.
Data on microplastics in breast milk and formula remain limited and often inconsistent due to variations in study design and analytical rigor. Methodological biases can contribute to reports of elevated microplastic concentrations. Meanwhile, higher-reliability studies report lower concentrations and demonstrate the importance of strict environmental controls during testing.
Feeding Equipment and Breast Milk Storage Contamination Sources
The bulk of existing research focuses primarily on infant feeding bottles (IFBs), while fewer studies address formula and solid-food containers. Investigations into breast milk, solid foods, and breast milk storage bags remain scarce in the current literature. For breast milk storage bags, exposure estimates range from 0.62 to 0.86 mg/day, representing the highest reported figures for this specific source.
However, the true proportion of plastic versus non-plastic material released from these storage bags remains uncertain because gravimetric measurements have inherent limitations. Furthermore, four recent reviews evaluated infant exposure to microplastics from food with a primary emphasis on breast milk and formula, but none examined nanoplastics or contamination in solid foods.
Regulatory Shortcomings and Future Research Needs
Current regulatory frameworks provide limited coverage of MNPs and fail to set infant-specific exposure or migration limits for plastic contaminants. According to the review, several previous literature reviews overlooked or misinterpreted key primary studies, and the authors identified multiple factual inaccuracies in existing summaries. Only one prior review systematically compared findings across studies and addressed other contamination sources like airborne microplastics.
The systematic review confirmed the presence of plastic-derived contaminants across several infant foods and feeding products, but concluded that the scale of infant exposure remains difficult to determine definitively. Inconsistent methodologies and limited regulatory oversight continue to impede clear risk assessment. It remains uncertain whether health effects occur at environmentally relevant exposure levels, and the review does not prove that the measured exposures result in adverse health effects in infants. Coordinated research and standardized testing protocols are urgently needed to improve exposure estimates and inform infant-specific policy.
Frequently Asked Questions
Do current regulations limit plastic contaminants in infant food?
No, current regulatory measures provide limited coverage of micro- and nanoplastics and do not establish infant-specific exposure or migration limits for these plastic contaminants.
Which infant feeding items have been studied the most?
The bulk of existing research focuses on infant feeding bottles, while studies addressing formula containers, solid-food containers, breast milk, and storage bags remain relatively scarce.
Do we know if these plastic contaminants cause health problems in infants?
The systematic review does not establish that measured exposures cause adverse health effects, and health impacts at environmentally relevant exposure levels remain uncertain.
What are your thoughts on these findings? Share your perspective in the comments below, or subscribe to our newsletter for the latest updates on food safety research and environmental health.
Keep reading