I'm looking more for a theme than any one specific fic:

Any fic where Lois asks Clark to help her have a baby (or Clark offers to help Lois have a baby), but they're only just friends (at least at the beginning). I know I've read some of these over the years, I'm just drawing a blank now as to titles and authors.

Thanks!!

What are Friends for? by Stopquitdont spring to mind... I know it's in Anne's Place

These aren't exactly what you described, but they all have a non-relationship L&C in which a baby is introduced:

Rest and Reproduction by Meredith Knight
A Gift for Life by StopQuitDont
Anybody's Baby by Annie M

Rest and Reproduction by Mere comes to mind...

Carol

A Gift For Life by Jenni and Squid

Thanks, everyone! I know I've read all of these before, it has just been a long time. Looks like I have a lot of reading ahead of me.