Was it something I said?

We went shopping this past weekend, Eric and I, and at Target I needed to use the bathroom. A mother and her two children were there in the sink area, the mother trying to get the two kids washed up and out the door. The older kid, a girl of maybe four or five, looked at me curiously. I smiled at her and went into a stall. The mother succeeded in washing up her younger girl and began walking out, and the older girl stopped in front of my stall and looked in at me through the crack between the door and the wall. I raised an eyebrow at her. Her mom called to her and she went out. I looked at myself in the mirror when I was washing my hands, but nothing about me seemed particularly wrong or unusual.