**Question:** Premature baby weighing 1000 gms or less is most likely to suffer from:

A. Respiratory Distress Syndrome (RDS)
B. Hypotension and Hypothermia
C. Hyperbilirubinemia
D. Infection (sepsis)

**Correct Answer:** A. Respiratory Distress Syndrome (RDS)

**Core Concept:** Premature infants are at a higher risk of developing complications due to immaturity of various organ systems, including the respiratory system.

**Why the Correct Answer is Right:** In premature infants, the respiratory system is not fully developed, particularly the lungs, which are unable to produce sufficient surfactant. Surfactant is a substance that prevents alveoli from collapsing, allowing proper gas exchange. When surfactant production is inadequate, the lungs become inflamed and fill with fluid, leading to respiratory distress syndrome (RDS). This results in the characteristic signs of respiratory distress, such as tachypnea, grunting, and decreased air entry on auscultation.

**Why Each Wrong Option is Incorrect:**

B. Hypotension and Hypothermia: Although these issues can occur in premature infants, they are not specific to those weighing 1000 gms or less. Hypotension and hypothermia can affect infants of any gestational age due to various factors like inadequate nutrition, infections, or complications from premature birth.

C. Hyperbilirubinemia: Hyperbilirubinemia, or jaundice, is primarily seen in premature infants due to increased hemolysis and impaired bilirubin clearance. However, it is not specific to infants weighing 1000 gms or less. Jaundice can occur in infants of any gestational age.

D. Infection (sepsis): Infection is a concern for premature infants due to immature immune systems and increased exposure to infections. However, it is not specific to infants weighing 1000 gms or less. Sepsis can affect infants of any gestational age.

**Clinical Pearl:** Premature infants are at a higher risk for complications due to immaturity of various organ systems, including the respiratory, cardiovascular, and neurological systems. Close monitoring and early intervention are essential to improve the outcomes of premature infants.