Got milk? The thin fluid known as colostrums often begins filling the breasts even before baby is born. Rich in antibodies, colostrums is the precursor to breast milk and helps a baby's tiny body defend against infection.
— co·los·tral \-trəl\ adjective
colostrum [kəˈlɒstrəm] n
(Medicine / Gynaecology & Obstetrics) the thin milky secretion from the nipples that precedes and follows true lactation. It consists largely of serum and white blood cells
[from Latin, of obscure origin]
Colostrums (also known as beestings or first milk) is a form of milk produced by the mammary glands in late pregnancy and the few days after giving birth. Human and bovine colostrums are thick, sticky and yellowish.
In humans, it has high concentrations of nutrients and antibodies, but it is small in quantity. Colostrums is high in carbohydrates, high in protein, high in antibodies, and low in fat (as human newborns may find fat difficult to digest).
Newborns have very small digestive systems, and colostrums deliver its nutrients in a very concentrated low-volume form. It has a mild laxative effect, encouraging the passing of the baby's first stool, which is called meconium. This clears excess bilirubin, a waste product of dead red blood cells which is produced in large quantities at birth due to blood volume reduction, from the infant's body and helps prevent jaundice. Colostrums contains large numbers of antibodies called "secretory immunoglobulin" (IgA) that help protect the mucous membranes in the throat, lungs, and intestines of the infant.
Leukocytes are also present in large numbers; these begin protecting the infant from harmful viruses and bacteria. Ingesting colostrums establishes beneficial bacteria in the digestive tract. Premature babies tend to fare better on human colostrums than commercial infant formulas.
Human milk contains special components, called growth modulators, that help the premature baby's digestive system adjust to oral feedings. Research indicates that premature babies fed formula tend to vomit more and continue tube feeding longer than those fed human colostrums and breast milk.