The first thing most babies do when they enter the world is cry. Not smile. Not relax. Not lie quietly. They cry. Loudly. And for parents, especially first time parents, that sound can be confusing.

It’s late at night. You haven’t had a good night’s sleep in weeks. And your baby is crying again. Historically, it’s been up to you to cycle through the diaper, bottle and/or comfort-object routine ...