It really depends on the severity of the split/break. Without photos we can only offer general information.
It may not be practical to try and save those split branches with a tree that young. In a larger tree with branches 4 inches in diameter, it is sometimes possible to bolt them back together and install cable supports to keep the branch intact. Although even in that case the branches do not re-attach and weld back together, but have to be supported artificially like this indefinitely.
If the split is very minimal and you are able to pull the branches back together and use tree staking wraps or wire inside of rubber hose, you may be able to save it. But if the splits are severe and the branch is hanging by thin wood, it may better to remove them, fertilize and water though the dry season and wait for growth response with new branching.
If this link doesn't work, search "split branch repair".