The majority of children for the April 2021 to March 2022 year would have been due their immunisations during the COVID-19 pandemic.
Roedd y rhan fwyaf o’r plant ar gyfer y cyfnod rhwng mis Ebrill 2021 a mis Mawrth 2022 i fod i gael eu himiwneiddio yn ystod pandemig COVID-19.