It's an inside joke.

**Overheard In The Car...

[John:] Tell Kristy I'm going to try and get you pregnant tonight. We'll get her that lung baby in nine months.

[Me:] 'kay.

*five minutes later, talking to Kristy on the phone*

[Kristy:] Okay, so I'll meet you there at quarter to three.

[Me:] Yep. We'll see you then. By the way, John wants you to know that he's going to try and get me pregnant tonight.

[Kristy:] Good. I need my mutant baby.

[Me:] We'll try. Really, really hard.

[Kirsten:] GAAAHHHH.

**My husband and I are 100% child-free. The baby thing is an inside joke. We have dogs. We do not want kids. Ever.