Okay, here's how I can tell them apart when they're together....Alex is on the left, he's the largest one. Alex is usually reddish in his complexion. He's easy to point out by size. Zach is in the middle and is yellowish in color. Notice the sunkeness under his eyes. Riley is the curious one, eyes open, hyper child. Usually his arms and legs are stiff and straight in their movements. Rexer says he's going to be a gymnast. Now separate these boys and mix them up and it's hard to tell them apart.