The birthing is creative posing with various poseboxes, and just that. As far as I know, there are no poseboxes with birthing poses either, though I wish I had one... 
There are no mods that lets the sims give birth in a different way. 
The 
baby blankets are by Tenshii (some recolors and other outfits 
here, and some cute onesies/dresses 
here), a lot of the other in Bloom's 
child/teen section (both mesh and recolor sections), and I have a huge bunch of baby clothing at 
my site (log in required to see).