Furthermore, some local authorities were unable to provide data for all children for dental checks, mental health problems, substance misuse problems and parenting capacity.
At hynny, nid oedd rhai awdurdodau lleol yn gallu darparu data ar gyfer pob plentyn ar gyfer archwiliadau deintyddol, problemau iechyd meddwl, problemau camddefnyddio sylweddau a gallu rhianta.