Summer pruning of water sprouts is normally done in July. It's mostly done to improve spray coverage and light distribution. Any shaping of the tree is normally done in late winter/early spring. If I was to take out a branch for whatever reason in the summer, I'd have done it before now to give it time to heal over before winter.
On newly planted trees I prune out broken branches and head the leader if needed. Other than that, any other pruning the first year would be if something broke for one reason or another. Then shape tree the following late winter/spring, even then I don't do to much the first year. If branches broke you either had poor nutrition to the tree, critters climbing, poor crotch angles and/or heavy icing.
It's not to uncommon for first year trees to have some nutritional needs. Don't worry to much , they will get stronger after a year or two as the root system grows.