K.P.
By the end of week one my son could hold up his head on his own, a real strong boy.
You have to let him grow and develop in his own time. If he managed to roll himself over once, I can guarantee you he will do it again. Let him. It is part of him growing. Don't worry so much be confident and proud of the milestone reached so soon. When he can roll on his own, he will be fine. Just be certain there aren't an abundance of pillows and blankets in the crib but he will learn to deal with those things too. Covers on or off, things arranged just the way he prefers for his crib.