Some children speak a language other than English or Welsh as their first language, either because they were born in a different country or because their parents speak a different language at home.
Mae rhai plant yn siarad iaith heblaw Saesneg neu Gymraeg fel eu hiaith gyntaf, un ai oherwydd iddynt gael eu geni mewn gwlad arall neu oherwydd bod eu rhieni'n siarad iaith wahanol yn y cartref.