One particularly painful experience of nursing mothers is the biting baby. My wife did not waste time finding a cure. When the baby bit, she pulled hair (an alternative has to be sought for baldheaded babies). Understand, the baby is not being punished, just conditioned.
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One of our girls who developed mobility early had a fascination with crawling up the stairs. At four months she was too unknowing to be punished for disobedience. But for her own good, we attempted to train her not to climb the stairs by coordinating the voice command of "No" with little spats on the bare legs. The switch was a twelve-inch long, one-eighth-inch diameter sprig from a willow tree.