Each National Olympic Committee (NOC) can enter a maximum of 4 competitors, 2 per each gender. As hosts, Argentina was guaranteed two quotas, 1 athlete per gender and a further 10 boys and 10 girls was to be decided by the Tripartite Commission. However only 9 girls were selected. The remaining 88 places shall be decided by team classification results from qualification events, namely the 2017 World Youth Championships and five continental qualification tournaments.[1]
To be eligible to participate at the Youth Olympics athletes must have been born between 1 January 2001 and 31 December 2003. Furthermore, NOCs will only be allowed to enter a single athlete in an event and the chosen athlete must have participated in either the 2017 World Youth Championships or a continental championship in 2017 or 2018.[1]
a Armenia, Azerbaijan, China, Kazakhstan, Russia, Turkey and Ukraine handed one-year ban from IWF for doping violations.[15] Afterwards IWF lifted doping suspensions against Turkey, Armenia and Azerbaijan.[16]
Girls' +63 kgSupatchanin Khamhaeng of Thailand originally won the gold medal, but was disqualified in 2019 after testing positive for a banned substance.[17]