Immediately upon delivery of a newborn's head, you should:

Upon delivery of a newborn's head, checking for a nuchal cord is crucial. A nuchal cord occurs when the umbilical cord is wrapped around the neck of the fetus. This can lead to potential complications such as cord compression, which might compromise the infant's oxygen supply. Identifying a nuchal cord right after the head is delivered allows for timely intervention. If one is present, it can often be slipped over the head, which is generally the safest and quickest way to ensure the infant is unharmed and able to breathe effectively.

While other actions are important in the overall care of a newborn, checking for a nuchal cord immediately upon delivery of the head is a critical first step to ensure the infant's safety.