Changing baby diapers is a daily essential task for parents, often repeated 6 to 10 times a day during the first months of life. According to the American Academy of Pediatrics, a baby uses about 3,000 diapers in the first year at an average of 6 diapers daily, totaling around 8,000 diapers over the diaper-wearing years. This high consumption, combined with rising prices, leads many parents to buy large quantities in advance, raising questions about diaper expiration and safety after the printed ‘best before’ date. Like other baby products such as formula and wet wipes, diapers have a ‘best before’ date to ensure optimal performance. Made mostly of paper and plastic, diapers are expected to last longer than the recommended 2 to 3 years by manufacturers. The date is set to guarantee maximum absorbency and leak prevention; after expiration, performance is not assured.

Signs of old diapers include discoloration, fading prints, loss or change of fragrance in scented diapers, and reduced absorbency due to moisture absorption by superabsorbent crystals if packaging is open or stored in humid conditions. Elastic parts may degrade over time, causing looseness and leaks. Old diapers are not toxic but may be less effective. It is advised not to store diapers for long periods and to monitor for leaks and skin irritation when using older diapers. Diapers should be stored in original packaging, away from direct sunlight, humidity, and heat. Unused diapers that no longer fit the child can be gifted or donated to families in need.