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Around 2 in 3 people who stammer have a family history of stammering, which suggests the genes a child inherits from their parents might make them more likely to develop a stammer. Stammering is more common in boys than girls. This can cause repetitions and stoppages, particularly when the child has lots to say, is excited, or feels under pressure.Īs the brain continues to develop, stammering may resolve or the brain can compensate, which is why many children stop stammering as they get older. Stammering can happen if some parts of this developing system are not co-ordinated. When every part of this system works well, the right words are spoken in the right order, with correct rhythm, pauses and emphasis.Ī child learning to construct simple sentences needs practice to develop the different speech areas in the brain and create the "wiring" (neural pathways) needed for the different parts to work well together. Speech development is a complex process that involves communication between different areas of the brain, and between the brain and the muscles responsible for breathing and speaking. It is not possible to say for sure why a child starts stammering, but it is not caused by anything the parents have done.ĭevelopmental and inherited factors may play a part, along with small differences in how efficiently the speech areas of the brain are working. The information here focuses on developmental stammering. It can also be caused by certain drugs, medicines, or psychological or emotional trauma acquired or late-onset stammering – is relatively rare and happens in older children and adults as a result of a head injury, stroke or progressive neurological condition.developmental stammering – the most common type of stammering that happens in early childhood when speech and language skills are developing quickly.Stammering varies in severity from person to person, and from situation to situation. Someone might have periods of stammering followed by times when they speak relatively fluently.įind out more about how stammering can affect you.