If it is strong it can still finish absorbing the yolk and be a perfectly healthy baby. I'd say just let it rest where it is unless it looks like it is going to move or thrash too much and possibly burst the yolk. If this seems to be the case, you can use some kind of sterilized container (like a small cup) and place the baby in there. Hopefully that will help it to feel more secure so that it doesn't kick and move so much. I've had a few (chicks and ducks) who seemed in such a hurry to get out, they didn't wait to finish. I lost one (it refused to sit quiet and burst the yolk). The rest grew up big and healthy.