Final answer:
The nurse would anticipate problems with the Babinski reflex after a prolonged birth due to wide shoulders as it can indicate potential neurological issues.
Step-by-step explanation:
The nurse would anticipate problems with the Babinski reflex, which is a superficial reflex commonly tested in newborns to establish the presence of neuromuscular function. When the plantar surface of the foot is stimulated, a normal response is seen where the infant's foot dorsiflexes and the toes extend and splay out. This is called a positive Babinski sign. However, in the context of the prolonged birth due to wide shoulders, neurological complications could affect this reflex, implying potential issues with the lower motor neurons (LMN) or the corticospinal tract that the Babinski reflex test is supposed to check.