Final answer:
A nurse would be particularly vigilant for intracranial hemorrhage in a neonate born at 29 weeks' gestation, as this condition is critical and the neonate's brain and blood vessels are still fragile.
Step-by-step explanation:
In a neonate born at 29 weeks' gestation, a nurse would be especially alert for the development of intracranial hemorrhage (C). This concern is due to the fact that the neonate's brain and surrounding blood vessels are fragile and underdeveloped at this stage. Premature infants are at high risk for this condition, which can occur spontaneously or due to minor trauma. Neonatal conjunctivitis (A) is also a risk, but it is more related to exposure to pathogens during delivery. Facial deformities (B) and incomplete myelinization (D) do not generally present immediate postnatal life-threatening risks like intracranial hemorrhage; however, incomplete myelinization does impact neurological functions and development but is an expected condition in preterm infants as myelinization is not completed until adolescence.