Initiation of Lactation (known as Lactogenises) is a series of cellular changes whereby mammary epithelial cells are converted from a non-secretory state to a secretory state.
Lactogenises II occurs following the expulsion of the Placenta, and can be delayed when part of the placenta is retained in the woman’s body; this is often referred to as “retained placenta”
The three main causes of a retained placenta are:
• When the uterus stops contracting, or doesn't contract enough for the placenta to separate from the wall of your uterus.
• When part or all of the placenta is stuck to the wall of your uterus and doesn't separate.
• When the placenta comes away from the uterus, but becomes trapped behind a semi-closed cervix.