A higher percentage of female babies had low birthweights than males, and a higher percentage of babies with Asian ethnic background had low birthweights compared to other ethnicities.
Roedd gan ganran uwch o fabanod benywaidd bwysau geni isel na babanod gwrywaidd, ac roedd gan gyfran uwch o fabanod gyda chefndir ethnig Asiaidd bwysau geni isel o gymharu ag ethnigrwydd eraill.