Just fewer than 4,600 child courses of treatment included the prescribing of antibiotics, 13.0% more than in the previous year.
Roedd hyn yn cynrychioli bron i 2.4 miliwn o gyrsiau unigol o driniaeth deintyddol o dan y GIG, gostyngiad o 0.4% o’i gymharu â 2016-17.