EVENT 103 Girls 12/13 Yrs 100m Breaststroke - Heats
| Heat Number - 1 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 2 | Holly Hildrew | 13 | Essex | 1:21.66 |
| 1 | 4 | Jodi Bunker | 13 | N & Durham | 1:21.34 |
| 2 | 6 | Erin Robertson | 13 | Scot West | 1:19.65 |
| 3 | 8 | Annabel Guye-Johnson | 12 | Kent | 1:18.90 |
| 4 | 10 | Sophia Green | 12 | Scot North | 1:18.35 |
| 5 | 9 | Katie Hodgeson | 13 | Surrey | 1:18.57 |
| 6 | 7 | Lara Bate | 12 | Cheshire | 1:19.48 |
| 7 | 5 | Katy Hebditch | 13 | Dorset | 1:21.21 |
| 8 | 3 | Leyla Manthorpe-Rizate | 12 | Herts | 1:21.50 |
| 9 | 1 | Maisie Cossins | 13 | Berks&SBucks | 1:22.00 |
| Heat Number - 2 |
| Lane | Comp.No. | Name | AaD | Club/Country | Time |
| 0 | 12 | Kayleigh Parker | 12 | Somerset | 1:17.76 |
| 1 | 14 | Eleanor McNally | 13 | Ox & N Bucks | 1:17.36 |
| 2 | 16 | Anna Doughty | 13 | Lancashire | 1:16.80 |
| 3 | 18 | Beth McFarlane | 13 | Scot East | 1:16.67 |
| 4 | 20 | Imogen Clark | 13 | Derbyshire | 1:12.20 |
| 5 | 19 | Charlotte Holmes | 13 | Yorkshire | 1:15.00 |
| 6 | 17 | Lauren O Connor | 13 | Middlesex | 1:16.80 |
| 7 | 15 | Elizabeth Hopkins | 13 | Hampshire | 1:17.02 |
| 8 | 13 | Kathryn Neville | 13 | Notts | 1:17.50 |
| 9 | 11 | Rebecca Twardochleb | 13 | Staffs | 1:18.24 |