![]() Interestingly, studies conducted in other countries have shown that the prevalence of thumb sucking is substantially lower (e.g., Vignarajah & Williams, 1992 Kharbanda et al., 2003), suggesting that thumb sucking may be influenced by cultural practices.Īlthough there is very little empirical support for the notion that thumb sucking is symptomatic of psychological disturbance or psychopathology in children (e.g., Tryon, 1968 Friman, Larzelere, & Finney, 1994), a number of physical problems are correlated with thumb sucking if it persists beyond the age of 4 or 5 years. Studies of the prevalence of thumb sucking show that one quarter to one half of children aged 3–6 years suck their thumbs (e.g., Troster, 1994 Widmalm, Christiansen, & Gunn, 1995 Gutermuth-Foster, 1998). ![]() Thumb and finger sucking (hereafter called thumb sucking) is common in early childhood.
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