Final answer:
Approximately 83% of North American mothers begin to breastfeed their infants in the hospital. Breast milk composition changes during the first days of lactation and in the course of a single feeding.
Step-by-step explanation:
The percentage of North American mothers who begin to breastfeed their infants in the hospital varies depending on several factors such as cultural norms and personal choice. However, research shows that in the United States, approximately 83% of mothers initiate breastfeeding in the hospital.
Breast milk composition changes during the first days of lactation and in the course of a single feeding to meet the specific needs of the baby. Initially, the milk produced is called colostrum, which is rich in antibodies and nutrients. As lactation progresses, the milk transitions into mature milk that contains the necessary balance of carbohydrates, proteins, and fats.