Similarly in 2022, 7.5% of babies whose mothers were aged between 25 to 29 were born pre-term, the smallest percentage of all age groups.
Yn yr un modd yn 2022, cafodd 7.5% o fabanod yr oedd eu mamau rhwng 25 a 29 oed eu geni’n gynamserol, sef y ganran leiaf o'r holl grwpiau oedran.