Mae datblygiad lleferydd, iaith a chyfathrebu yn ragfynegydd pwysig o gynnydd mewn llythrennedd yn nes ymlaen. Dengys tystiolaeth y gall sgiliau gwael gael effaith andwyol ar ystod eang o ddeilliannau i blant, sy’n cynnwys ymddygiad, iechyd meddwl, pa mor barod ydynt am yr ysgol a chyflogadwyedd.
Speech, language and communication development is an important predictor of later progress in literacy. Evidence shows that poor skills can have an adverse impact on a wide range of children’s outcomes including behaviour, mental health, “school readiness” and employability.