Seven in ten (70%) multiple births had a birthweight of between 2kg and 3kg, while one in eleven (9%) multiple births weighed more than 3kg.
Roedd gan saith o bob deg (70%) o enedigaethau lluosog bwysau geni rhwng 2kg a 3kg, tra bod un o bob un ar ddeg (9%) o enedigaethau lluosog yn pwyso mwy na 3kg.