I agree with jones5cm, don't grease the mold...there's really no reason to, it will pop right out!
To start out, color your fondant/gumpaste the flesh color you want. Then make a skinny egg shape with your fondant. For me, I start by pushing the smaller end of the fondant "egg" into the head area, then the rest will follow, the torso, and finally the little butt and legs. I continuously squish the fondant/gumpaste into the mold for a minute or two until I feel like it should be in every crevice. I cut off any remaining fondant/gumpaste, then I put it in the freezer for 10-15 minutes. When you take it out, pull back the mold and it should pop right out! For coloring/dusting, you can follow the (wonderful!) tutorial on CC...http://cakecentral.com/articles/683/how-to-make-a-gumpaste-baby-with-mold#more-683
Okay, so that is pretty much the same instructions I said...must be where I learned to make it! LOL!
Here are how mine turned out....http://cakecentral.com/gallery/1849601http://cakecentral.com/gallery/1796283http://cakecentral.com/gallery/1935377
Good luck...post pics when you're done!