What's the big giveaway!

So first off, people can be sooooo weird. My friends and I have been pretty appalled lately at people's comments during pregnancy. I have had a couple friends be asked if they were having multiples and in my opinion, you don't mess with a hormonal pregnant woman! Anyways, so here's my great random comment. I am checking out at Walmart last night and in quite a hurry. The lady is very intrigued by my newborn. She keeps staring at him in his stroller, asking several questions, and in the meantime, forgetting to do her job, cashiering! As we were finally finishing up she says, "You're nursing, I can tell." I am quite confused and just look at her and she says, "aren't you?" I simply say, "Yes, bye, have a good night!" Okay, what in the heck. I look down at myself, look at Teagan, and still leave all confused. I don't know what in the world she was talking about! Ahh, some people!