Sometimes Ryan does this short little yell over and over. It took me a while to figure out what that translated to. At first I thought he might be hungry but he refused to eat. Next I thought he might be gassy but after patting his back for what felt like forever, he refused to burp. Then one day I laid him in his bouncy seat and in minutes he was asleep. The next time I noticed the yelling I popped in a pacifier and again, he was asleep in minutes. So after a little experimenting, I was able to determine that yelling = tired.
Babies are such a mystery and half the time I am only guessing what he wants or needs. But with a little trial and error I am slowly but surely figuring this kid out.