Which one of the following is the special type of milk produced by a lactating mother, essential for the development of immune response of newborn baby in human?

Colostrum is the specialized first milk produced by a lactating mother during pregnancy and the initial days after childbirth. It is distinct from mature breast milk, characterized by a thick, yellowish appearance and a unique nutrient profile. Colostrum is exceptionally rich in immunoglobulins (antibodies) and bioactive factors such as IgA, cytokines, and growth factors, which are essential for boosting the newborn's immune system and protecting against illnesses [1]. It contains significantly higher protein and zinc concentrations compared to mature milk while being lower in fat and sugar to facilitate easier digestion for the infant. This 'first milk' typically lasts for two to four days before transitioning into transitional milk and eventually mature milk. Its primary biological role is to confer passive immunity and support the early development of the infant's immune response [1].

Sources

1. [1] https://www.sciencedirect.com/science/article/pii/S0022316622029571