Speechless

So, Greg and I went to his coworker's party last night. It was a good time although we didn't know anyone other than Greg's coworker and his wife. But I have to say, sometimes we enjoy those types of situations - it forces us to get out of our comfort zone and make conversation with people we don't know. We brought Landon and he did pretty well. Having him there is great for two reasons - 1) Whenever we felt awkward not talking to anyone, we could concentrate on Landon and 2) He is a great conversation starter. However, one very brief conversation was even more awkward BECAUSE of Landon. So, as everyone knows, Landon has a big noggin. My boss even calls him Charlie Brown, and I have to say, I quite agree with that nickname - he has a big bald head with a couple curliques on top. Anyway, some man entered into a conversation that Greg and I were having with his coworker and I will try to recreate it....
Greg's Coworker: "He's a big boy! Look at that noggin!"
Greg and I: (random statements of agreement and smiles)
Random Man at Party: "I am sure it wasn't fun pushing that head out!"
Crickets chirping.
I felt like the room went silent.
What do you say to that? I mean, with my friends, I could come up with some witty remark. But to him? I mean, we hadn't even been introduced! Now, I don't get offended easily, and I wasn't offended this time - I was just speechless. I had no idea how to counter. Funny thing is that I had a C-section, but did I really want to go into labor details with a random stranger? So the best I could come up with was an exaggerated eye roll and a comment like "You don't even know!" or something to that effect. And then I figured that the conversation about my girl parts needed to end and we went into another room for more small talk with strangers.