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The present study sought to investigate distribution of birth months for the players participating in FIBA U-17 basketball World Championship 2018, between different playing positions and compare these differences to performance parameters in male (n=192) and female (n=192) participants. The distribution of birth months, body height and match statistics was collected for the analysis. The results show that relative age effect is prevalent in both male (χ²=27.2;df=2;p<0.001) and female (χ²=22.9;df=2;p<0.001) categories and in all playing positions, except for centers. Players in the male category were significantly better in regards to minutes played, points scored and efficiency. When the performance parameters were normalized to playing minutes, efficiency per minute remained statistically significant. Players in the female category were significantly better in regards to playing minutes and points scored. Even though there is an overrepresentation of players born early in the season it was the players born late that performed better in the World Championships. This study could be useful for coaches and organizations for further development of young basketball players.