Thumb sucking is a perfectly normal habit for babies and young children, but while most grow out of it by age five, some never do. Some experts believe that adult thumb sucking is quite common, with around 1 in 10 adults secretly engaging in the habit for comfort. “I think that.
As Johns Hopkins Medicine points out, thumb sucking is a common childhood habit that starts early. While thumb sucking isn't an issue in babies or young children, adult thumb sucking may be embarrassing and in some cases may pose oral health problems. Thumb sucking in infants and.
Clinical psychologist Helen Nightingale says adult thumb-sucking happens automatically and can have a familial cause. 'It's often passed down.