So not only am I writing baby fic but I've been searching it out as well. I came across this short series by imaginary_iby .
They're mostly fluff but this one ("The Greatest Thing You'll Ever Learn") literally broke me. I was sobbing through the whole thing. Remind me to never read fic during this time of the month. The story's basic plot is that Nine regenerates into Ten and poor Molly (the kid in question) may not be able to handle it. Nor can the Doctor when he thinks she might not love him. *sigh* yeah...just yeah.
Anyways, go read it. It's good.