Almost 9 out of 10 births were from White ethnic backgrounds, but this percentage has decreased by 2 percentage points from five years ago.
Roedd bron i 9 o bob 10 genedigaeth yn dod o gefndiroedd ethnig Gwyn, ond mae'r ganran hon wedi gostwng 2 bwynt canran o gymharu phum â mlynedd yn ôl.