Don't be hard on yourself if you missed a dose, ok?
The instructions are fine-tuned for optimal benefit and should be followed. But a missed medicinal dose is not going to kill a kid unless it's a life-sustaining drug and I don't know of a a single one for ratties. Give it as soon as possible. But if the kid had a setback don't blame yourself or the late drug administration, ok? Prednisone is not going to save or kill a kid with an extra dose or a missed one.