This study uses national Grade (G) 3 Early Grade Reading Assessment (EGRA) data from 2013, when G3 students learned to read in Filipino and English rather than a mother tongue, and comparable data from 2019, when G3 students would have, according to policy, first learned to read in their mother tongue. The data were used to better understand the role of L1 complexity in L2 and L3 reading acquisition. Sample: 241 schools; 232 schools were the same in 2013 and 2019. Final sample used for analysis: 2,264 G3 students in 2019 and 2,267 G3 students in 2013. Children were assessed in Filipino (L2) and English (L3). Secondary analysis of the data set looked at reading performance and changes in reading performance according to language complexity.