What to do with the Afterbirth?

My sister, Rozi gave birth to a baby girl last Saturday giving my parents their 10th grandchild and Rozi's parents' in laws their 1st grandchild. When we visited her, one of the topic was the placenta or the afterbirth which my sister said I have never written about. I told her I wrote about it at least twice, once around 4 years ago and another about 2 years ago. So I checked and retrieved the