GO FOR 100% WHOLE GRAIN
Step one to getting better bread into kids' lunch boxes: Look for "100% Whole Grain" on the label, and make sure the first ingredient is a 100% whole-grain flour, whether it's wheat, oat, rye, amaranth, etc. "Whole Grain" or "Whole Wheat" is not enough. Those may only contain 51% whole-grain flour (and 49% refined).
SORT OUT GRAIN SERVINGS
There are plenty of whole-grain breads that deliver one serving of whole grains—16g of the 48g recommended each day. A quick way to find them: Look for the Whole Grains Council 100% stamp. In fact, 16g is on the lower end of the spectrum, and more is better. Since one serving is usually one slice, a PB&J can give a kid two-thirds of his or her daily whole grains.