I'm 16 weeks and I've just started getting a recognizable bump. People at work have known for a couple of weeks now, but I am now obviously growing. I'm getting a lot of "You're getting bigger!" Or, "Looks like the baby is growing!" comments. Not necessarily compliments but not really offensive (to me, at least. I'm not really sensitive about things.. yet haha)

How do you respond? I've been like, "Yep! *smile*" Or "Sure am!" haha am I supposed to say thanks..? I don't want to seem sarcastic in my response but I literally have no idea how to respond to "observational" comments.