soft as a baby's bottom

*soft as a baby's bottom

 and soft as a baby's backside; *soft as down; *soft as silk; *soft as velvet
Cliché very soft and smooth to the touch. (*Also: as ~.) This cloth is as soft as a baby's bottom. The kitten's fur was as soft as down. Your touch is soft as silk. This lotion will make your skin soft as velvet.
See also: bottom, soft