Morphological awareness is characterized by the ability to intentionally reflect and manipulate morphemes. The present study aimed to characterize the development of morphological awareness in school-age children and to analyze its impact on reading and spelling. The sample was comprised of 60 children with typical language development in Portuguese primary schools with a mean age of 8.6 (standard deviation = 0.1), 30of which attended the 2nd grade and 30 the 4th grade. The data was analyzed considering the use of language assessment instruments, reading and spelling and morphological awareness tests adapted from other studies. The results showed a significant difference in morphological awareness between the 2nd grade and the 4th grade. Although with different statistical proportions, there was a positive correlation between morphological awareness and reading, and between this metalinguistic capacity and spelling in both groups. An association is suggested between morphological awareness and reading and spelling and a difference in this correlation between the two degrees.