Let them get established. It takes 3 to 5 years for a tree to be truly established. My father said that you should only trim when your knife was sharp, the with this young tree very little should be trimmed.

There are two exceptions to what I said above. Any sprout that is growing vertically from a limb should be removed These will grow into the tree and cause problems in later years. Any limbs starting on the trunk. These "limbs" on the trunk appear first as a clump of leaves.

think of it this way ...

every leaf is an energy making machine ... every one removed now.. will generate that much less stored energy.. to grow the roots .. to speed your babes to maturity ...

so just dont do it.... think in tree time.. counted in decades .. not you impatience at the speed at which they appear growing.. at this moment in time ...

and further keep in mind.. the real growth is happening .. where you cant see it.. underground ...

ken