My First Sippy Cup 7oz
One of the best-selling sippy cups in the U.S. Labeled BPA-free, but independent testing found BPS (a BPA replacement with similar hormonal activity) leaches into liquids.
This is a rating of this specific product only — not the company. Other products from this brand may score differently.
Sippy cups are used by toddlers for hours every day, filled with warm liquids that accelerate chemical leaching. A 2021 study published in Food Chemistry tested 13 brands of sippy cups and found that all of them released BPA or BPS into liquids — including brands labeled 'BPA-free.' BPS, the most common BPA replacement, has been shown in research to have similar estrogenic activity to BPA. Toddlers are in a critical window of hormonal and neurological development, making endocrine disruptor exposure particularly concerning during this period.
Why We Rated It This Way
A 2021 peer-reviewed study found all 13 sippy cup brands tested released bisphenol chemicals including BPS into liquids. BPS has similar estrogenic activity to BPA. Toddlers are in a critical developmental window.
Chemical & Health Analysis
Each chemical of concern is broken down below — what it is, where it comes from in this product, what it does to the body, and who is most at risk.
BPS (Bisphenol S)
Polypropylene plastic body
BPA replacement with similar estrogenic activity. Leaches into liquids, especially warm ones. Linked to hormonal disruption, altered brain development, and reproductive effects in animal studies.
Polypropylene microplastics
Plastic cup body
Microplastic particles shed into liquids, especially when heated or scratched. Toddlers ingest microplastics directly with every use.
All health claims are based on published, peer-reviewed research from the NIH, WHO, IARC, and peer-reviewed journals. This information is for educational purposes and does not constitute medical advice.
