My Twinn is a legitimate website selling dolls which look like the child you're buying them for.
First you pick an outfit, skin tone, and hair and eye colour. You send in a photograph of your child, and the artists craft the doll to resemble the photograph, including painting on such things as freckles or birthmarks. You can also buy matching outfits for the doll and child, and matching accessories.
The dolls do seem very well made - they really do look like the children they're made for. One of the testimonials from previous customers states that "Over the years many people have mistaken the doll as a real child!"
I think that is my trouble with them - they look very creepy to me.