Mae dau blentyn sy'n rhagweld robot feddygon a rocedi'n rhan o ddyfodol y gwasanaeth iechyd wedi cael eu dyfarnu'n brif enillwyr cystadleuaeth tynnu lluniau i ddathlu 70 mlwyddiant y GIG.
Two children, whose vision of the future of the health service includes robot doctors and rockets, are the overall winners of a drawing competition to celebrate the 70th anniversary of the NHS.