Quote from Esther Clavin in Ma's Little Maggie
Esther Clavin: Oh, I haven't looked at these in ages. Margaret: Is that Cliff? Esther Clavin: Oh, my, no. That's Clifford's father. You see where Clifford got his wide bottom. Margaret: Mm. I've always wondered. Esther Clavin: When Clifford was a baby, we'd set him down and gently push him over. And wouldn't you know, he'd pop right back up just like, just like one of those inflatable clowns!