Last night I went to an industry party, which means I spent the entire evening dodging strangers.
Why? Because I can predict exactly when it will happen, and what will solicit the remark. I make great efforts to steer the conversation elsewhere, but tedious verbal gymnastics only delay the inevitable:
"You look too young to be a mother."
Sometimes this is a compliment, or a pickup line. But more commonly the sentiment is accompanied by crossed arms, puzzlement, dismay, and often, extremely rude questions.