California enacts ingredient disclosure law for children's diaper packaging

California's Governor signed AB1901 on 28 September 2026, requiring children's diapers sold in the state to list all intentionally added ingredients on outer packaging and on a dedicated manufacturer website by 1 January 2029. Full labelling compliance for diapers sold in the state is required by 1 July 2029.

Why this mattersA state-level ingredient-disclosure mandate forces diaper makers and their packaging suppliers to redesign labels and build ingredient-tracking systems, a template other US states may follow.

• California Governor signed AB1901 into law on 28 September 2026
• By 1 January 2029 outer packaging of children's diapers must list all intentionally added ingredients and a website link
• By 1 January 2029 manufacturers must publish full ingredient lists with CAS numbers on a dedicated website, ordered by weight predominance
• Full labelling compliance for all children's diapers sold in California is required by 1 July 2029
• Law covers disposable briefs, protective underwear, liners, boosters, inserts, underpads and diaper components such as wetness indicators and adhesive tabs

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