Diapers to change for over 1 million babies under new proposal

Parents of more than 1 million California babies may soon get a clearer look at what’s inside their children’s diapers under a new state proposal. 

A recent release from the Environmental Working Group (EWG) highlights a California bill that would require full ingredient disclosure on all children’s diapers sold in the state—potentially affecting purchases for nearly 1.3 million babies. 

The bill, known as Assembly Bill 1901, was introduced during the 2025–2026 legislative session and focuses on ingredient disclosure rather than banning specific substances. If passed, diaper manufacturers would be required to publicly list all intentionally added ingredients used in children’s diapers, both online and on product packaging.  

Under the proposal, manufacturers would first need to make ingredient information available on their websites and on online product listings by January 1, 2028.  

A year later, diaper packaging sold in California would also need to include directions to where that information can be found, along with a full list of intentionally added ingredients. 

The legislation defines children’s diapers broadly, covering products designed for infants and toddlers that absorb or contain urine or fecal waste. This includes not only disposable diapers, but also protective underwear, liners, inserts and underpads.  

Individual components—such as wetness indicators, adhesives, dyes and fragrances—would also fall under the disclosure requirements.  

AB 1901 is co-sponsored by advocacy organizations including EWG, Consumer Reports and Children Now, and is framed as a consumer transparency measure.  

Supporters argue that parents currently have limited visibility into the materials and chemicals used in diapers, despite the fact that babies wear them continuously during some of the most sensitive stages of development. 

While the bill does not prohibit the use of specific chemicals, it would require manufacturers to name each intentionally added ingredient, include its Chemical Abstract Service (CAS) number, and explain the function it serves in the product.  

The goal, supporters say, is to allow parents and caregivers to make more informed choices when comparing diaper brands. 

The proposal also includes enforcement mechanisms. State regulators, as well as local and state attorneys, would be authorized to ensure compliance. Companies found in violation could face civil or administrative penalties, with higher fines for repeat offenses.  

The bill has been referred to the Assembly Committee on Environmental Safety and Toxic Materials, where it will continue through the legislative process.  

If approved, California would become one of the first states to require comprehensive ingredient transparency for children’s diapers, potentially setting a precedent for similar policies elsewhere.