8.1% of pupils (8,695) were in infant classes of over 30 pupils, down from 8.2% (8,794) in January 2017.
Roedd 8.1% o ddisgyblion (8,695) mewn dosbarthiadau babanod o dros 30 o ddisgyblion, i lawr o 8.2% (8,794) ym mis Ionawr 2017.