During the initial assessment and at birth, women are either asked to self-report if they are a smoker or they are tested with a carbon monoxide (CO) monitor.
Yn yr asesiad cychwynnol ac ar adeg yr enedigaeth gofynnir i fenywod hunangofnodi a ydynt yn smygwyr, neu rhoddir prawf carbon monocsid iddynt trwy ddefnyddio teclyn synhwyro.