Final answer:
Breast milk composition changes during lactation and within a single feeding, with colostrum being produced in the early days and the milk becoming more watery and abundant. Within a feeding, the milk starts as foremilk, lower in fat, and becomes creamier and higher in fat content.
Step-by-step explanation:
The composition of breast milk undergoes changes during the first days of lactation and in the course of a single feeding. In the early days after childbirth, the breast produces a thick, concentrated milk called colostrum. Colostrum is rich in antibodies and nutrients that provide essential protection and nourishment to the newborn. As the days go by, the composition of breast milk changes to become more watery and abundant, providing the necessary hydration and nutrients for the growing baby.
During a single feeding, breast milk also changes in composition. The initial milk that comes out, called foremilk, is lower in fat content and quenches the baby's thirst. As the feeding progresses, the milk becomes creamier and higher in fat content, providing energy and promoting growth.