Okay, to be honest. If you dont want to like cuff the hands and/or feet then i'd first recomend you to make sure that ur babys knees doesnt get hurt, i know my knees hurts alot when crawling, so some extra padding there to make it comfortable. Then i would say, reward each time the baby crawls, ignore the standing up, only pay attention and rewarding when the baby crawls. I know its much more fun to be rewarded than punished, the worst punishment is being ignored. Now if that method doesnt work, well a hard, and then i mean a really hard and long spanking on the bare butt, deep shade of red every third day ur baby stands up, scolding are also good with this.