Wanted: Baby Poker

Sometimes in TV commercials, there is a baby crying.  I was wondering: do they make the baby cry or wait around until he cries on his own?  Who’s job is it to make the baby cry, and how do they do it?  Maybe they poke the baby.  So what does that guy put on his resume?  “Experienced baby poker – reduced commercial production time by 18% by creative baby poking methods.  Unique ability to make even the happiest baby cry in under 20 seconds.”