Their new "big girls'" life started on Monday at Taihape Area School for 5-year-old twins Ella and Nina Hernando.
The tiny girls were delighted to be at school and loved their uniform, even though their skirts were down to their ankles.
To help staff know who was who, Ella had a pink tie in her hair and Nina wore yellow.
Principal Richard McMillan said 26 new students had started at the school for 2017.
The new students were all ages with a few leaving boarding schools to come and live at home and go to school locally, he said.