The Baby’s Physiological Changes at Birth

Your baby’s circulatory system will change at the moment of birth. While he is in your uterus, your baby receives his oxygen from your red blood cells via the placenta. At birth, he will begin to expand his lungs and breathe on his own. Your caregiver may suction his nose and mouth to remove any mucus that may be present and hampering his breathing. The baby’s heart will begin to pump blood to his lungs to pick up the oxygen that he will now be breathing in. After the umbilical cord is cut, certain internal blood vessels that carried blood to and from the cord will no longer be needed and will become ligaments.