Final answer:
Colostrum provides essential immunoglobulins for the newborn's immune system and helps with meconium expulsion.
Step-by-step explanation:
Colostrum is the milk produced in the first few days after birth, and it is extremely important for newborns. It contains immunoglobulins that boost the newborn's immune system, providing them with the necessary gastrointestinal and systemic immunity to adjust to the nonsterile environment. Additionally, colostrum helps the newborn's digestive system expel meconium (the first stool) and clear bilirubin. It also satisfies the newborn's thirst with the foremilk and their appetite with the hindmilk.