The quantity of the Colostrum (a few spoons per feed) is more than enough to feed your baby during the first few days, before your mature milk comes in.
In normal circumstances, your mature milk will come in at the third or fourth day after birth. This is due to the production of a hormone called Prolactin. Prolactin stimulates the mammary glands in your breasts to produce milk (lactation).
In some cases the onset of milk can be delayed, meaning it will take a few days longer to “come in”. Some mothers will only start producing milk after seven to fourteen days after birth.
A lot of research has been done on the delayed onset of milk, but the direct cause has not yet been discovered.
According to the experts, the following factors play a role in the delayed onset:
Some of the placenta might have been left in your body. This rarely happens, but it is still possible. The presence of the placenta will result in a delay of the production of Prolactin. If you continue to have heavy bleeding after birth, this could be the reason. A normal ultrasound should pick it up immediately.
Stress caused by a difficult birth or any other factors can influence your milk production.
Cesarean (surgical) delivery: A cesarean delivery is not according to nature and it may result in the delayed production of the hormone Prolactin. Rest assured, your body is amazing! The moment your baby suckles on your breast, your brain will get the message to start developing the hormone.
Infection or illness with fever.
Medical conditions: Medical conditions such as diabetes or thyroid conditions can cause slow or delayed production of milk.
Strict or prolonged bed rest during pregnancy.
Hormonal Issues (such as hypothyroidism or PCOS).
Theca Lutein Cysts: This is a type of cyst that produces testosterone and the heightened levels of testosterone can delay the production of milk. They usually go away on their own after a few weeks after birth.