Justin Paget/Getty Images“Do you have any more kids or just the one?” It’s a question I’ve been asked countless times by fellow parents at various birthday parties or school pickups while we stand around watching our kiddos play. And my answer is always the same: “No, it’s just my son. He’s an only child.” The question has always seemed innocent enough and without any detectable judgment. But there’s just something about that phrase “just the one” that’s always rubbed me the wrong way. As if one, by itself, isn’t enough or less than what it should be.As an only child myself, I never thought of...