After Ariel Gave Birth to a Healthy Baby Boy,the Physician

After Ariel gave birth to a healthy baby boy,the physician immediately placed the baby next to Ariel's breast so the infant could begin breastfeeding.This practice _____.

A) suppresses Ariel's metabolic rate,so her body can shift more energy into milk production
B) enables the baby's "let-down" reflex to occur,so his gastrointestinal tract will function normally
C) increases the baby's heart rate,reducing his risk of myoendocarditis
D) stimulates Ariel's uterus to contract,reducing her risk of bleeding excessively