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the seedling has some energy stored to last alittle while. i would wait till you have a few more leaves before feeding. or feed someting very weak like kelp.
Wait till about 4 weeks or you have two sets of true leaves. If the bottom most leaves are starting to turn a little pale...then it is definitely ready for nutes at 1/4 strength to start, and go up from there until you see a little tiny bit of burning on the leaf tips. Now you know what the max amount of food the plant will take is.