Question

Before lactation begins, the woman's breast may secrete a yellowish liquid rich in protein that contains antibodies to help protect the baby from disease. this liquid is

Answer 1

This liquid is colostrum.
Colostrum or also called first milk is produced by the mammary glands just before giving birth. Beside its immunoprotective effects (contain immune cells and antibodies) it also has a laxative effect that helps babies expel the tarry first stools (meconium).