Final answer:
During an emergency delivery, when the head is out, one should feel for the fetal heartbeat.
Step-by-step explanation:
During an emergency delivery, when the head is out, one should feel for the fetal heartbeat. This is an important step to assess the baby's well-being and ensure that the heart is beating normally. Feeling for the umbilical cord around the neck, amniotic fluid leakage, and maternal pulse rate are also essential parts of the delivery process, but they are not specifically related to feeling for the head during an emergency delivery.