one-size diaper

• one size diaper

From the notion that the diaper is intended to fit the baby from, or near, birth until they are toilet-trained, thus coming in only one size; compare one-size-fits-all.

one-size diaper (plural one-size diapers)

1. (Canada, US) A type of cloth diaper which can be adjusted and lengthened to match the baby's growth, thus allowing the diaper to be worn from around birth (by a newborn) to potty-training age.
   • 1954, “A One-Size Diaper”, in Today's Health, volume 32, American Medical Association, page 72:

     Yes, now there is a one-size diaper for all age babies—the famous Dexter Diaper. Mothers everywhere are enthusiastic about the way they fit! their neatness and comfort to baby.

   • 2009 February 5, Willa Plank, “Can We Swap Our Pampers?”, in The Wall Street Journal‎^[1]:

     This one-size diaper was one of the testers' favorite. It's made out organic-cotton velour and has a cotton and hemp pad, which can be placed inside the diaper's pocket or on top of the velour.

   • 2021, Bailey Bouwman, Cloth Diapers: The Ultimate Guide to Textiles, Washing & More, Simply Bailey Social Marketing, →ISBN, page 21:

     The one size diaper (OS) is the most available cloth diaper on the market. The OS diaper is marketed for kids 8-35lbs (sometimes 10-40lbs), or birth to potty training. One size diapers fit most kids. There is always an exception. Some kids are small and some kids are big.

• OS diaper, birth-to-potty diaper, (Commonwealth) one-size nappy