The data is collected by health visitors and other health professionals on paper forms which are submitted to administrative staff who manually enter data onto the child health system.
Caiff y data ei gasglu gan ymwelwyr iechyd a gweithwyr iechyd proffesiynol eraill ar ffurflenni papur sy'n cael eu cyflwyno i staff gweinyddol sy'n rhoi data â llaw yn y system iechyd plant.