A new study found that speech difficulties are linked with difficulties in learning to read when children first start school, but these effects are no longer apparent at 8 years of age.

Researchers confirmed that early language impairment that co-occurs with speech difficulties predicts poor literacy skills at both 5½ and 8 years of age. Having a family history of dyslexia had a small but significant effect on literacy at both ages, above and beyond the effects of speech and language.

"Speech difficulties can be a warning sign, but it is only when a child also has weak language skills that they are likely to lead to significant reading problems, especially if there is a family history of dyslexia," said Dr.. Marianna Hayiou-Thomas, lead author of the Journal of Child Psychology and Psychiatry study.

Article: When does speech sound disorder matter for literacy? The role of disordered speech errors, co-occurring language impairment and family risk of dyslexia, Marianna E. Hayiou-Thomas, Julia M. Carroll, Ruth Leavett, Charles Hulme and Margaret J. Snowling, Journal of Child Psychology and Psychiatry, doi: 10.1111/jcpp.12648, published 7 November 2016.