: Between days 3 and 5 after birth, your milk transitions from colostrum to white, thinner mature milk.
Lactation is the process by which a parent's body produces milk to feed an infant, primarily driven by the hormone . It operates on a supply-and-demand system , where frequently emptying the breasts signals the body to produce more milk. Getting Started lactating
: Your body begins producing colostrum —a thick, nutrient-rich "liquid gold"—around 16 to 22 weeks of pregnancy. : Between days 3 and 5 after birth,