"Rub a little schmaltz on it, it'll be fine."
If I rub a little schmaltz on it, it will grow prematurely. That would really disrupt the post-bris luncheon.
I know. We Jews are such optimists that when a boy is only a week old, we cut off a little, knowing that it will grow back, and then some.
At a bris we sing, “Let it grow, let it grow, let it grow”.