No idea. Its actually a really common practice all around the world. My wife was going to try it out. We have all the stuff to do it, but in the end she just couldn't haha. Apparently it has quite a few health benefits for post-baby mothers. Increased milk production, reduction of postpartum depression, helps get hormones back on track faster ect.
Best part, was it sat in our freezer for a year or so before she finally decided to get rid of it. There were numerous occasions where I went to grab a steak and grabbed it instead :barf: only to realize what it was and put it back and grab something else. I think she purposely didn't label it hoping that would happen.....