Stuttering or stammering is a problem of speech disorder some people have when they speak. Five to six percent of children have a stammer while one percent of adults have a stammer. Men are 4 times more likely to have a stammer than women. Stammers normally start at 2-6 years and run in families. The person knows what they want to say but the flow of their speech is ‘bumpy’ and may have some of the following features: