I'm saying most friends take an interest in each other's life and a kid is a bloody big part of that. Just because i have no real reason to know about my colleague's life doesn't stop me asking how x's son is doing in their gcses etc. I find talking to my colleagues about their kids or hobbies or whatever helps me get to know them more and appreciate their situation if anything cropped up. People i consider friends take an interest in me as i do with them even if the subject is something i hvae no interest in like kite surfing. I just thought it worked that way for all people, guess not.
I appreciate babies can be boring and you are limited in your interaction with them but i thought we were talking about all kids here? Anyways i'm waffling, I see no reason why people should really get annoyed by kids turning up at work or be surprised that people take an interest.