Abstract Objective: to assess mental health issues in pediatric nurses during coronavirus pandemic in 2019. Method: cross-sectional study was conducted with pediatric nurses at the Instituto da Criança e do Adolescente based on online self-rated survey about clinical practice and mental health impact during COVID-19 pandemic. Validated self-reported scales for anxiety, depression and burnout were used for assessing these professionals. Results: 107/298 (36%) nurses answered, 90% were female, median age was 41(23-64) years, 68% worked with adolescents, 66% in frontline. Burnout, anxiety and moderate/severe depression occurred in 65%, 72% and 74%, respectively. Lack of standardized treatment protocol for nurses (27%vs.10%, p=0.049), moderate/severe depression (74% vs. 16%, p=0.002) and burnout (82% vs. 58%, p=0.01) were significantly higher in pediatric nurses with anxiety compared to those without. Pediatric nurses that worked with adolescents compared to those that did not showed higher frequency of burnout in the former group (77% vs. 32%, p=0.0001). Multivariable analysis revealed that adequate quarantine adherence increased the presence of anxiety in 4.6 times [OR4.6(CI 1.1-20.2), p=0.04]. Conclusion: most pediatric nurses who had worked in the frontline of COVID-19 were under precarious conditions, working with reduced team, and with an expressive changes in their monthly income. Current anxiety was a relevant issue, burnout was also an important mental condition for these professionals, reinforcing culture of good teamwork, collaboration practices and psychological/psychiatric approach.