Baby Crying Self to Sleep OK, Says Study

And finally tonight, the sound of a crying baby is unbearable. Even though a lot of doctors have said let your baby cry when they can't sleep, even if you have to talk yourself down. Well, tobt... See More

And finally tonight, the sound of a crying baby is unbearable. Even though a lot of doctors have said let your baby cry when they can't sleep, even if you have to talk yourself down. Well, tobt scientists say they have new proof. Who does the crying hurt the most, the baby, the parent? Here's abc's david wright. Reporter: How do you handle this situation? Is all the crying bad for the baby? This father has found a shortcut. But obviously he would prefer to sleep in his own bed. Today the journal of pediatrics weighed in with a new study that looks at the levels of cortisol, a stress hormone in children's brains. It found that babies allowed to cry for short periods of time were no more stressed out than babies whose parents camped out with them. In other words, a little crying does no lasting damage. It's just hard if you happen to be a person who hates to hear another person suffer. [ Crying [. Reporter: But as cam from "modern family" could tell you it's tough on mops and dads too. In fact, the authors of this new study don't recommend letting babies cry it out because it's too stressful for parents. This mommy and me yoga class every mommy can relate to that. I just literally can't stand to hear him cry. Everything in my body tenses up and feels like I'm getting adrenaline. Reporter: How many of you sleep with your baby? All of them raised their hands except one. Hearing too much of this sound can lead to depression. For me, I'm going to be -- Reporter: Exactly. And sleep deprived. Well, yes. Reporter: The good news, it's usually just a phase for the baby and the parent. David wright, abc news, los angeles.