How can we understand what babies are crying about? Does their cry sound different when they are hungry compared to when they are tired?

Yes. I know what they want when listen to their crying. As a new parent looking for answers, you may need to turn to context cues to determine if there is a reason behind your infant's cries. Sometimes the reason for the tears is fairly obvious. Other times, you just want to throw up your hands and sob yourself. If she last ate two hours ago, chances are good she's hungry. Or if she's been awake for 90 minutes or more, she's probably tired.