All are true of colostrum except
**Core Concept**
Colostrum is the first milk produced by the mammary glands of female mammals, including humans, during the first few days postpartum. It is rich in protein, antibodies, and other nutrients essential for the newborn's immune system development and adaptation to life outside the womb.
**Why the Correct Answer is Right**
Colostrum provides a unique blend of immunoglobulins, growth factors, and other bioactive molecules that help protect the newborn from infections and promote intestinal maturation. The high concentration of immunoglobulins, particularly IgG, IgA, and IgM, helps to neutralize pathogens and provides passive immunity to the newborn. Additionally, colostrum contains growth factors like epidermal growth factor (EGF) and insulin-like growth factor-1 (IGF-1) that stimulate the growth and differentiation of intestinal cells.
**Why Each Wrong Option is Incorrect**
**Option A:** While colostrum is indeed rich in protein, this statement is too vague and does not distinguish it from other types of milk.
**Option B:** This statement is true and highlights the importance of colostrum in providing passive immunity to the newborn.
**Option C:** This statement is also true and underscores the role of colostrum in promoting intestinal maturation and development.
**Clinical Pearl / High-Yield Fact**
A key characteristic of colostrum is its low volume production, typically less than 100 mL per day, which is why it is essential to ensure that newborns receive adequate colostrum in the first few hours postpartum to establish a strong immune system.
**Correct Answer:** A.