It's resin. I did find a way to do it yourself online, which was also pretty awesome.
For some people, breastfeeding is "just" a way of feeding their baby. And obviously that's fine. For others it means more than that. There are a lot of reasons why breastfeeding was - and continues to be - an important part of my life, and a beautiful thing like this is a lovely way to remember it.
Again, the comparison to other bodily fluids is ridiculous. Show me another bodily fluid that contains HAMLET cells, for example.