Answer: Aphids do not eat holes in leaves. Instead, they gather on the most tender leaves and flower buds and suck the fluids from within the tissues. Since we don't know what exactly is feasting on your seedlings I think the safest thing to do is to wash them off. Just pouring a glass of water over the leaves should at least get the bugs off the plants. If you can collect a few of the pests and put them in a plastic bag, you can take them to your local nursery for positive identification. Once you know what they are, you can choose a control measure to eliminate them from your new plants.
Best wishes with your plants!
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