We know that parents do not cause a child to stammer. Stammering is not a result of anything parents do or their parenting style. A person may be more likely to develop a stammer due to a combination of factors, such as, genes, gender and brain development but there is not one reason for a stammer to develop or continue beyond childhood.
Parents naturally play a vital role in supporting their child with their stammer to help them develop into confident communicators.
For more information on possible causes, see 'what causes stammering' knowledge article.