You better cover that seedling with a wire basket or something or a rodent will come along and nip it right off. I had some foot high or so in one gallon pots and one night a packrat nipped a lot of the branches right off. One was nipped and only had a stem left, no leaves. They all came back and Monday I repotted them all into 5-gallon containers.
Oh, I know it! I've got them covered with a wire mesh hoop until they get too big for the little buggers to damage. Something nipped off the top of one of them before I even knew it was through the ground. Hopefully it will come back.
