12 mth vaccination -

Hi parents, may i check if child under LOA can they still get their jab? My child had missed his 12 mth jabs such as measles jab twice as he was ill but this time he received a LEave of absence(LOA) from infant care. Will polyclinic allow to continue with Jab or have to postpone again..he is 13 and half. How long the 12 mth jab be postponed to? With the rising covid..everytime he is due of his jab, he falls ill or may get LOA again.