An Infant Who Was Stable for a Day After Birth

An infant who was stable for a day after birth now demonstrates pallor,tachycardia,tachypnea,and circumoral cyanosis.The parent asks how the child might have a heart problem when he was stable yesterday.What information by the nurse is most accurate?

A) "Blood incompatibilities can cause this problem, so we will test the mother's blood."
B) "Symptoms may not appear until fetal circulation routes begin to close after birth."
C) "The extra blood from the umbilical cord may have kept the baby stable for a while."
D) "Your baby may have gotten an infection during birth that now is causing problems."