The heart won't be able to keep up with the amount of blood it needs to pump, starting the slow process of cardiac failure. (lovinmypup.com)
This pain occurs because the heart isn't getting the amount of blood it needs, and your heart needs to work harder. (termlife2go.com)
Blood from the placenta is transferred into your baby providing it the additional blood it needs to profuse his or her lungs and provide pulmonary (lung) circulation. (natural-parenting-advice.com)