Boundaries can be tough. Sometimes they are clearly marked, painted yellow, like the line across the train platform that reminds commuters to “mind the gap.”

Other times they are not so well-defined. For kids like my son, knowing when to draw the line, under what circumstances certain words or behaviors are okay, and under what circumstances they are not, can be extremely tricky.

In recent weeks, we’ve been using a word around the house and with each other as a term of endearment or to convey happiness or coolness or silliness. The word is baby. As in, don’t worry, baby. Or, okay baby. Or even, yeah, baaabbbbyyy. And in all this time, it never once occurred to me that baby could be bad.

Today, my son got in a bit of trouble for calling one of the girls in his class a baby. Thing is, I don’t think he called her a baby. I think he called her baby. As in, okay, baby, let’s take out those math books.

Regardless, it came across as name-calling. Either he couldn’t articulate the context or no one asked. He had to apologize. It wasn’t that big of a deal and he wasn’t even that upset about it, but it made me stop and think.

Some things are easy to teach. Others, not so much.