EVENT 103 Female 12/13 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 1 | 1 | Josie Powell | 13 | SW Wales | 1:29.00 |
| 2 | 3 | Elise Timms | 13 | Bedfordshire | 1:25.84 |
| 3 | 5 | Alice Wallinger | 13 | Northants | 1:25.36 |
| 4 | 7 | Evelyn Dyer | 12 | Staffs | 1:24.59 |
| 5 | 6 | Emilie Webb | 13 | Lincolnshire | 1:24.66 |
| 6 | 4 | Ava Highfield | 12 | Shropshire | 1:25.62 |
| 7 | 2 | Caitlyn Hillier | 13 | Wiltshire | 1:27.15 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club | Time |
| 0 | 9 | Florrie Spicer | 13 | Gloucs | 1:22.41 |
| 1 | 11 | Kate Schillinger | 13 | Cheshire | 1:20.44 |
| 2 | 13 | Verity Hamilton | 13 | Norfolk | 1:19.49 |
| 3 | 15 | Maisie Simpson-Dawson | 13 | Leics | 1:18.17 |
| 4 | 17 | Halle Robinson | 13 | Dorset | 1:16.65 |
| 5 | 16 | Madison Christoforos | 13 | Scot North | 1:17.24 |
| 6 | 14 | Ivy Manning | 13 | Ox & N Bucks | 1:18.90 |
| 7 | 12 | Megan Daniel | 13 | Cornwall | 1:20.34 |
| 8 | 10 | Tyra Sajudeen | 13 | Cambs | 1:20.90 |
| 9 | 8 | Kara Van Der Merwe | 13 | Cumbria | 1:23.37 |