Younger pregnant women (aged 19 or younger) had the lowest percentage of BMI 30 or more, while older pregnant women (aged 40 or older) but had the highest.
Y menywod beichiog ieuengaf (19 oed neu iau) oedd â’r ganran isaf o BMI 30+, a’r menywod beichiog hŷn (40 oed neu hŷn) oedd â’r canran uchaf.