Children in this age group who are classed as being at clinical risk are already being offered the vaccine and more than one in four have already taken up the offer of vaccination.
Mae plant yn y grŵp oedran hwn sy'n cael eu dosbarthu fel rhai sy’n wynebu risg glinigol eisoes yn cael cynnig y brechlyn ac mae mwy nag un o bob pedwar eisoes wedi manteisio ar y cynnig.