Update: Good Comment by Zurixon:
Submitted on 2013/02/28 at 9:28 pm
In SL you can get pregnant if you have a pregnancy hud attached to your avatar. If you want to play this role, then you will have to decide for a baby brand. You can find free babies but will not be something spectacular. The best babies cost about 5000$L (20 u$s). Zooby, LatinBaby, Espejito, Honeydew are the most famous brands. I design clothes and toys for one of these brands, also I made a movie about them. You can watch it in youtube: http://www.youtube.com/watch?v=ffJfAiorh_U
I have written before about virtual maternity and childbirth in the Second Life game.
In the below video we see another virtual pregnancy and 3d childbirth from a loving couple giving birth in the Second Life game.
It is quite an experience and afterward you can care for the infant in virtual baby games.