Thai-Blogs.com has this article today, from which I'll quote...
The foetuses all come from illegal abortions. Once they are dried out, a black magic ceremony is performed to turn this into a Kumong Tong or Golden Boy. Some people believe that the spirit of the un-born child will protect them and keep them safe from danger. They are often worn in an amulet around the neck or close to the body
If you feel benevolent and particularly generous, this writer always appreciates things bought for him from his wishlist