They read a few medical reports explaining that some babies cry to help them go to sleep, but others really need an emotional touch. Crying doesn't help them go to sleep. It actually makes them more anxious. The studies show that that personality never changes and if you have a baby that needs emotional support, you are essentially abandoning them in the most anxious and stressed out moment. Furthermore, there's a strong link to sleep training with those kind of babies and a lifetime of depression.