The rate at birth for children whose mothers were aged 35 or older was 31 percentage points higher than those whose mothers were aged 19 or younger.
Roedd y gyfradd bwydo ar y fron adeg geni ar gyfer plant yr oedd eu mamau yn 35 oed neu'n hŷn 31 pwynt canran yn uwch na'r rhai yr oedd eu mamau yn 19 oed neu'n iau.