In its early years a tree may need some formative pruning to encourage it to develop a good shape. Removing some of the lower branches is the most common operation. Remember that a branch only 0.5m above ground in a young tree will still be only 0.5m above ground when the tree is mature.
You should avoid pruning until the tree has been in the ground for at least a year. Immediately after being planted the tree is quite stressed enough without further damage.