A nurse is assessing a newborn who was born at 42.5 weeks of gestation. Which of the following findings should the nurse expect?
Faint red marks on the plantar surface.
Copious vernix.
Dry, cracked skin.
Scant scalp hair.
The Correct Answer is C
Choice A rationale
Faint red marks on the plantar surface are more common in preterm infants and are not typically seen in post-term infants.
Choice B rationale
Copious vernix is usually seen in preterm infants. Post-term infants often have little to no vernix.
Choice C rationale
Dry, cracked skin is a common finding in post-term infants due to prolonged exposure to the amniotic fluid.
Choice D rationale
Scant scalp hair is more common in preterm infants. Post-term infants usually have more developed hair.
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Correct Answer is D
Explanation
Choice A rationale
Newborns are not born with fully developed immune responses. Their immune system is immature and continues to develop after birth. They rely on maternal antibodies for initial protection.
Choice B rationale
Newborns do not have a mature gut microbiome immediately after birth. The gut microbiome develops over time and is influenced by factors such as breastfeeding and exposure to the environment.
Choice C rationale
Newborns do not rely solely on their innate immune system. They receive passive immunity from maternal antibodies transferred through the placenta and colostrum, which provides initial protection against infections.
Choice D rationale
Newborns receive passive immunity through the placenta and colostrum, but their own immune system is not fully functional until several months of age. This passive immunity helps protect them from infections during the early months of life.
Correct Answer is B
Explanation
Choice A rationale
Small for gestational age (SGA) refers to newborns whose birth weight is below the 10th percentile for their gestational age.
Choice B rationale
Appropriate for gestational age (AGA) refers to newborns whose birth weight is between the 10th and 90th percentiles for their gestational age. A newborn weighing 3350 g at 39 weeks gestation falls within this range.
Choice C rationale
Low birth weight is defined as a birth weight of less than 2500 g, which does not apply to this newborn.
Choice D rationale
Large for gestational age (LGA) refers to newborns whose birth weight is above the 90th percentile for their gestational age.