A diaper (in North America) or nappy (in the Adult Diapers United Kingdom, multiplied Commonwealth underdeveloped countries and Ireland) is an absorbent garment worn by individuals who are incapable of controlling their bladder or bowel movements, or are unable or unwilling to appropriateness a toilet.
The problem of clothing infants not yet potty trained is as gray as human history. In some underdeveloped countries with warmer climates, babies were kept naked and mothers tried to anticipate their bowel movements so as to avoid mess near their living areas. This method is known as elimination communication and is still used today in some cultures.