Caleb has this ability to make his baby sisters laugh. It really doesn't take much effort on his part and he'll just be doing something silly and they'll be laughing their heads off. He just has a way with them, and they absolutely adore him, especially at Sophia's age now. It was the same when Sarah was below the age of 1.
Here's 2 videos of him with Sophia.
She's just laughing herself silly with his antics.
In this video, she's laughing so hard, she can't even lift her head of the bed.
