| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Great Britain & N.I. Junior |  GBR | 39.14 Q WLJ | |
| 2 | Japan Junior |  JPN | 39.48 Q NJR | |
| 3 | Hungary Junior |  HUN | 40.31 q NJR | |
| 4 | Chile Junior |  CHI | 41.19 NJR | |
| 5 | Israel Junior |  ISR | 41.41 NJR | |
| Spain Junior |  ESP | DNF | ||
| Italy Junior |  ITA | DNF | 
| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | France Junior |  FRA | 39.91 Q | |
| 2 | Trinidad and Tobago Junior |  TTO | 40.33 Q NJR | |
| 3 | Portugal Junior |  POR | 40.73 | |
| 4 | United States Junior |  USA | 41.01 | |
| 5 | Mexico Junior |  MEX | 41.66 | |
| Australia Junior |  AUS | DQ | 
| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Poland Junior |  POL | 39.61 Q NJR | |
| 2 | Jamaica Junior |  JAM | 39.94 Q SB | |
| 3 | Germany Junior |  GER | 40.34 q SB | |
| 4 | New Zealand Junior |  NZL | 40.42 SB | |
| 5 | Switzerland Junior |  SUI | 40.57 SB | |
| 6 | Qatar Junior |  QAT | 41.06 | |
| South Africa Junior |  RSA | DNS |