In 2022, 6.5% of babies whose mothers were aged between 25 and 29 had low birthweights, the smallest percentage of all age groups.
Yn 2022, roedd gan 6.5% o fabanod yr oedd eu mamau rhwng 25 a 29 oed bwysau geni isel, sef y ganran leiaf o'r holl grwpiau oedran.