Final answer:
Preterm newborn infants have unique features that should be considered, including viability, fetal growth deficit, health assessment, and physical characteristics.
Step-by-step explanation:
Newborn infants, especially preterm infants, require special considerations for their features. One important consideration is the viability of the fetus, which refers to the point in fetal development when the fetus is likely to survive outside the uterus. Fetal growth deficit or intrauterine growth restriction (IUGR) may occur due to maternal, fetal, or placental factors. Another consideration is the health assessment at birth, which includes an Apgar test to determine if urgent medical care is needed. Physical characteristics of newborns may include the presence of vernix, lanugo, and soft spots in the skull called fontanels.