label: History of thumb sucking past the age of four years
label_lc: history of thumb sucking past the age of four years
description: Thumb sucking is a behavior that ceases spontaneously in most children between 2 and 4 years of age. If thumb sucking continues, negative consequences can occur, such as a deformity of the nail or paronychia. This term refers to a history of habitual thumb sucking past the age of 4 years of life.